diff --git a/Georeferencing-1/UT_GeoRef_1.ifc b/Georeferencing-1/UT_GeoRef_1.ifc
index 8425e10d..ca6abafe 100644
--- a/Georeferencing-1/UT_GeoRef_1.ifc
+++ b/Georeferencing-1/UT_GeoRef_1.ifc
@@ -7,7 +7,7 @@ ISO-10303-21;
 HEADER;
 FILE_DESCRIPTION (('ViewDefinition [Ifc4X3NotAssigned]'), '2;1');
 FILE_NAME ('UT_GeoRef_1.ifc', '2020-07-27T12:00:00', ('Stefan Jaud'), ('bSI Infra Extension Deployment project'), 'manual text editing', 'SublimeText 3.0', 'GitHub pull request');
-FILE_SCHEMA (('IFC4X3_RC2'));
+FILE_SCHEMA (('IFC4X3_RC3'));
 ENDSEC;
 
 DATA;
@@ -37,11 +37,11 @@ DATA;
 /* ------- coordinate reference system --------------------------------------------------------- */
 #30 = IFCPROJECTEDCRS('EPSG:5834', 'DB_REF / 3-degree Gauss-Kruger zone 4 (E-N) + DHHN92 height', 'EPSG:5684', 'EPSG:5783', 'Gauss-Kruger', '4', #18);
 /* ------- MapConversion provides information about the global-to-local transformation --------- */
-#31 = IFCMAPCONVERSION(#28, #30, 4468005., 5334600., 515., 1., 0., 1.);
+#31 = IFCMAPCONVERSION(#28, #30, 4468005., 5334600., 515., 1., 0., 1., 1., 1.);
 
 /* ------- UT Tin_1 ---------------------------------------------------------------------------- */
 /* ------- IfcSite is the top most element in the spatial structure ---------------------------- */
-#32 = IFCSITE('27H$neCQf1NwtmczxBInPR', $, $, $, $, #33, #40, $, .ELEMENT., $, $, $, $, $);
+#32 = IFCSITE('27H$neCQf1NwtmczxBInPR', $, $, $, $, #33, $, $, .ELEMENT., $, $, $, $, $);
 /* ------- The IfcSite's placement is the top-most placement and uses the same ----------------- */
 /* ------- IfcAxis2Placement as IfcGeometricRepresentationContext does ------------------------- */
 #33 = IFCLOCALPLACEMENT($, #29);
diff --git a/Georeferencing-3/GeoRef-3-d48.ifc b/Georeferencing-3/GeoRef-3-d48.ifc
new file mode 100644
index 00000000..f3c74e49
--- /dev/null
+++ b/Georeferencing-3/GeoRef-3-d48.ifc
@@ -0,0 +1,78 @@
+ISO-10303-21;
+
+/* ------- This file was produced manually for IFC Infra Extension Deployment project. --------- */
+/* ------- (and my PhD) ------------------------------------------------------------------------ */
+/* ------- The file should come with a README.md with supplementing info. ---------------------- */
+/* ------- Stefan Jaud, stefan.jaud@tum.de, 2021.03.20. ---------------------------------------- */
+
+HEADER;
+FILE_DESCRIPTION (('ViewDefinition [Ifc4X3NotAssigned]'), '2;1');
+FILE_NAME ('GeoRef-3-d48.ifc', '2021-03-20T12:00:00', ('Stefan Jaud'), ('bSI Infra Extension Deployment project'), 'manual text editing', 'SublimeText 3.0', 'GitHub pull request');
+FILE_SCHEMA (('IFC4X3_RC3'));
+ENDSEC;
+
+DATA;
+
+/* ------- UT ProjectSetup_1 ------------------------------------------------------------------- */
+#1 = IFCDIMENSIONALEXPONENTS(0, 0, 0, 0, 0, 0, 0);
+#2 = IFCDIRECTION((1., 0., 0.));
+#3 = IFCDIRECTION((0., 1., 0.));
+#4 = IFCDIRECTION((0., 0., 1.));
+#5 = IFCCARTESIANPOINT((0., 0., 0.));
+#16 = IFCPROJECT('2DAvEupIz0HQr73cMaawtY', $, 'GeoRef_1', 'The bare minimum of an IFC file exchange with simple georeferencing meta data.', $, $, $, (#28), #17);
+#17 = IFCUNITASSIGNMENT((#18, #19, #20, #24, #25, #26, #27));
+#18 = IFCSIUNIT(*, .LENGTHUNIT., $, .METRE.);
+#19 = IFCSIUNIT(*, .AREAUNIT., $, .SQUARE_METRE.);
+#20 = IFCSIUNIT(*, .VOLUMEUNIT., $, .CUBIC_METRE.);
+#22 = IFCSIUNIT(*, .PLANEANGLEUNIT., $, .RADIAN.);
+#23 = IFCMEASUREWITHUNIT(IFCPLANEANGLEMEASURE(0.017453292519943295), #22);
+#24 = IFCCONVERSIONBASEDUNIT(#1, .PLANEANGLEUNIT., 'degree', #23);
+#25 = IFCSIUNIT(*, .MASSUNIT., .KILO., .GRAM.);
+#26 = IFCSIUNIT(*, .TIMEUNIT., $, .SECOND.);
+#27 = IFCMONETARYUNIT('EUR');
+#28 = IFCGEOMETRICREPRESENTATIONCONTEXT($, 'Model', 3, 1.E-6, #29, #54);
+#29 = IFCAXIS2PLACEMENT3D(#5, #4, #2);
+
+/* ------- UT GeoRef_1 ------------------------------------------------------------------------- */
+/* ------- ProjectedCRS provides information about the underlying geodetic --------------------- */
+/* ------- coordinate reference system --------------------------------------------------------- */
+#30 = IFCPROJECTEDCRS('EPSG:3912', 'MGI 1901 / Slovene National Grid', 'EPSG:3906', $, 'Gauss-Kruger', '5', #18);
+/* ------- MapConversion provides information about the global-to-local transformation --------- */
+#31 = IFCMAPCONVERSION(#28, #30, 430500., 137100., 0., 1., 0., 1., 1., 1.);
+
+/* ------- UT SpatialStructure_1 --------------------------------------------------------------- */
+/* ------- IfcSite is the top most element in the spatial structure ---------------------------- */
+#32 = IFCSITE('27H$neCQf1NwtmczxBInPR', $, $, $, $, #33, $, $, .ELEMENT., $, $, $, $, $);
+/* ------- The IfcSite's placement is the top-most placement and uses the same ----------------- */
+/* ------- IfcAxis2Placement as IfcGeometricRepresentationContext does ------------------------- */
+#33 = IFCLOCALPLACEMENT($, #29);
+/* ------- Project/Spatial structure ----------------------------------------------------------- */
+#35 = IFCRELAGGREGATES('3Hu7f6BmT14B_XS9yS78Jr', $, $, $, #16, (#32));
+
+/* ------- UT Georef-3 ------------------------------------------------------------------------- */
+/* ------- Representation of the building's outline: ------------------------------------------- */
+/* ------- Polyline with six points ------------------------------------------------------------ */
+#40= IFCPRODUCTDEFINITIONSHAPE($,$,(#41));
+#41= IFCSHAPEREPRESENTATION(#28,'Axis','Curve2D',(#42));
+#42= IFCPOLYLINE((#43,#44,#47,#48,#45,#46,#43));
+#43 = IFCCARTESIANPOINT((92.58,63.68));
+#44 = IFCCARTESIANPOINT((91.82,69.10));
+#45 = IFCCARTESIANPOINT((88.26,60.37));
+#46 = IFCCARTESIANPOINT((87.95,62.90));
+#47 = IFCCARTESIANPOINT((77.37,66.98));
+#48 = IFCCARTESIANPOINT((78.67,58.98));
+
+/* ------ IfcBuilding has a representation of its outline -------------------------------------- */
+#50 = IFCBUILDING('28H$neCQf1NwtmczxBInPR', $, $, $, $, #53, #40, $, $, $, $, $);
+/* ------ Spatial inclusion in the project ----------------------------------------------------- */
+#51 = IFCRELAGGREGATES('3Hu7f6BmT14B_XS9yS78Jq', $, $, $, #32, (#50));
+/* ------ Placement is relative to that of IfcSite according to the spatial structure ---------- */
+/* ------ The way it is modelled, there is no offset and no rotation. -------------------------- */
+#52 = IFCAXIS2PLACEMENT3D(#5, #4, #2);
+#53 = IFCLOCALPLACEMENT(#33, #52);
+
+/* ------ TrueNorth of the geometric context must be a 2D vector ------------------------------- */
+#54 = IFCDIRECTION((0.,1.));
+
+ENDSEC;
+END-ISO-10303-21;
diff --git a/Georeferencing-3/GeoRef-3-d96.ifc b/Georeferencing-3/GeoRef-3-d96.ifc
new file mode 100644
index 00000000..b4d44180
--- /dev/null
+++ b/Georeferencing-3/GeoRef-3-d96.ifc
@@ -0,0 +1,78 @@
+ISO-10303-21;
+
+/* ------- This file was produced manually for IFC Infra Extension Deployment project. --------- */
+/* ------- (and my PhD) ------------------------------------------------------------------------ */
+/* ------- The file should come with a README.md with supplementing info. ---------------------- */
+/* ------- Stefan Jaud, stefan.jaud@tum.de, 2021.03.20. ---------------------------------------- */
+
+HEADER;
+FILE_DESCRIPTION (('ViewDefinition [Ifc4X3NotAssigned]'), '2;1');
+FILE_NAME ('GeoRef-3-d96.ifc', '2021-03-20T12:00:00', ('Stefan Jaud'), ('bSI Infra Extension Deployment project'), 'manual text editing', 'SublimeText 3.0', 'GitHub pull request');
+FILE_SCHEMA (('IFC4X3_RC3'));
+ENDSEC;
+
+DATA;
+
+/* ------- UT ProjectSetup_1 ------------------------------------------------------------------- */
+#1 = IFCDIMENSIONALEXPONENTS(0, 0, 0, 0, 0, 0, 0);
+#2 = IFCDIRECTION((1., 0., 0.));
+#3 = IFCDIRECTION((0., 1., 0.));
+#4 = IFCDIRECTION((0., 0., 1.));
+#5 = IFCCARTESIANPOINT((0., 0., 0.));
+#16 = IFCPROJECT('2DAvEupIz0HQr73cMaawtY', $, 'GeoRef_1', 'The bare minimum of an IFC file exchange with simple georeferencing meta data.', $, $, $, (#28), #17);
+#17 = IFCUNITASSIGNMENT((#18, #19, #20, #24, #25, #26, #27));
+#18 = IFCSIUNIT(*, .LENGTHUNIT., $, .METRE.);
+#19 = IFCSIUNIT(*, .AREAUNIT., $, .SQUARE_METRE.);
+#20 = IFCSIUNIT(*, .VOLUMEUNIT., $, .CUBIC_METRE.);
+#22 = IFCSIUNIT(*, .PLANEANGLEUNIT., $, .RADIAN.);
+#23 = IFCMEASUREWITHUNIT(IFCPLANEANGLEMEASURE(0.017453292519943295), #22);
+#24 = IFCCONVERSIONBASEDUNIT(#1, .PLANEANGLEUNIT., 'degree', #23);
+#25 = IFCSIUNIT(*, .MASSUNIT., .KILO., .GRAM.);
+#26 = IFCSIUNIT(*, .TIMEUNIT., $, .SECOND.);
+#27 = IFCMONETARYUNIT('EUR');
+#28 = IFCGEOMETRICREPRESENTATIONCONTEXT($, 'Model', 3, 1.E-6, #29, #54);
+#29 = IFCAXIS2PLACEMENT3D(#5, #4, #2);
+
+/* ------- UT GeoRef_1 ------------------------------------------------------------------------- */
+/* ------- ProjectedCRS provides information about the underlying geodetic --------------------- */
+/* ------- coordinate reference system --------------------------------------------------------- */
+#30 = IFCPROJECTEDCRS('EPSG:3794', 'Slovenia 1996 / Slovene National Grid', 'EPSG:4765', $, 'Gauss-Kruger', '5', #18);
+/* ------- MapConversion provides information about the global-to-local transformation --------- */
+#31 = IFCMAPCONVERSION(#28, #30, 430200., 137600., 0., 1., 0., 1., 1., 1.);
+
+/* ------- UT SpatialStructure_1 --------------------------------------------------------------- */
+/* ------- IfcSite is the top most element in the spatial structure ---------------------------- */
+#32 = IFCSITE('27H$neCQf1NwtmczxBInPR', $, $, $, $, #33, $, $, .ELEMENT., $, $, $, $, $);
+/* ------- The IfcSite's placement is the top-most placement and uses the same ----------------- */
+/* ------- IfcAxis2Placement as IfcGeometricRepresentationContext does ------------------------- */
+#33 = IFCLOCALPLACEMENT($, #29);
+/* ------- Project/Spatial structure ----------------------------------------------------------- */
+#35 = IFCRELAGGREGATES('3Hu7f6BmT14B_XS9yS78Jr', $, $, $, #16, (#32));
+
+/* ------- UT Georef-3 ------------------------------------------------------------------------- */
+/* ------- Representation of the building's outline: ------------------------------------------- */
+/* ------- Polyline with six points ------------------------------------------------------------ */
+#40= IFCPRODUCTDEFINITIONSHAPE($,$,(#41));
+#41= IFCSHAPEREPRESENTATION(#28,'Axis','Curve2D',(#42));
+#42= IFCPOLYLINE((#43,#44,#47,#48,#45,#46,#43));
+#43 = IFCCARTESIANPOINT((22.202,51.125));
+#44 = IFCCARTESIANPOINT((21.442,56.545));
+#45 = IFCCARTESIANPOINT((17.882,47.815));
+#46 = IFCCARTESIANPOINT((17.572,50.345));
+#47 = IFCCARTESIANPOINT((6.992,54.425));
+#48 = IFCCARTESIANPOINT((8.292,46.425));
+
+/* ------ IfcBuilding has a representation of its outline -------------------------------------- */
+#50 = IFCBUILDING('28H$neCQf1NwtmczxBInPR', $, $, $, $, #53, #40, $, $, $, $, $);
+/* ------ Spatial inclusion in the project ----------------------------------------------------- */
+#51 = IFCRELAGGREGATES('3Hu7f6BmT14B_XS9yS78Jq', $, $, $, #32, (#50));
+/* ------ Placement is relative to that of IfcSite according to the spatial structure ---------- */
+/* ------ The way it is modelled, there is no offset and no rotation. -------------------------- */
+#52 = IFCAXIS2PLACEMENT3D(#5, #4, #2);
+#53 = IFCLOCALPLACEMENT(#33, #52);
+
+/* ------ TrueNorth of the geometric context must be a 2D vector ------------------------------- */
+#54 = IFCDIRECTION((0.,1.));
+
+ENDSEC;
+END-ISO-10303-21;
diff --git a/Georeferencing-3/Georef-3-D48-OIP.png b/Georeferencing-3/Georef-3-D48-OIP.png
new file mode 100644
index 00000000..399aed7f
Binary files /dev/null and b/Georeferencing-3/Georef-3-D48-OIP.png differ
diff --git a/Georeferencing-3/Georef-3-D96-OIP.png b/Georeferencing-3/Georef-3-D96-OIP.png
new file mode 100644
index 00000000..92125ab6
Binary files /dev/null and b/Georeferencing-3/Georef-3-D96-OIP.png differ
diff --git a/Georeferencing-3/readme.md b/Georeferencing-3/readme.md
new file mode 100644
index 00000000..342c7c65
--- /dev/null
+++ b/Georeferencing-3/readme.md
@@ -0,0 +1,34 @@
+
+### Intent
+
+This scenario provides the outline of a house in two separate files with different georeferencing:
+
+- D48/GK (EPSG:3912)
+- D96/TM (EPSG:3794)
+
+The content of both files should overlay if interpreted correctly (up to a certain precision).
+
+### Prerequisites
+
+This scenario builds upon following other scenarios:
+
+- Georeferencing-1
+- SpatialStructure-1
+
+### Content
+
+This scenario covers the following additional concepts and/or IFC entities:
+
+- representation of `IfcBuilding`:
+    - `IfcPolyline`
+
+### Supporting files
+
+Following files correspond to this scenario:
+
+| Filename                          | Description                               |
+|:----------------------------------|-------------------------------------------|
+| `GeoRef-3-d48.ifc`                | the building's outline in D48/GK as IFC file         |
+| `GeoRef-3-d96.ifc`                | the building's outline in D96/TM as IFC file         |
+| `GeoRef-3-D48-OIP.png`            | screen shot of D48/GK file loaded in TUM Open Infra Platform |
+| `GeoRef-3-D96-OIP.png`            | screen shot of D96/TM file loaded in TUM Open Infra Platform |
diff --git a/Georeferencing-4/GeoRef-4.ifc b/Georeferencing-4/GeoRef-4.ifc
new file mode 100644
index 00000000..6f2aa665
--- /dev/null
+++ b/Georeferencing-4/GeoRef-4.ifc
@@ -0,0 +1,95 @@
+ISO-10303-21;
+
+/* ------- This file was produced manually for IFC Infra Extension Deployment project. --------- */
+/* ------- (and my PhD) ------------------------------------------------------------------------ */
+/* ------- The file should come with a README.md with supplementing info. ---------------------- */
+/* ------- Stefan Jaud, stefan.jaud@tum.de, 2021.03.22. ---------------------------------------- */
+
+HEADER;
+FILE_DESCRIPTION (('ViewDefinition [Ifc4X3NotAssigned]'), '2;1');
+FILE_NAME ('GeoRef-4.ifc', '2021-03-22T12:00:00', ('Stefan Jaud'), ('bSI Infra Extension Deployment project'), 'manual text editing', 'SublimeText 3.0', 'GitHub pull request');
+FILE_SCHEMA (('IFC4X3_RC3'));
+ENDSEC;
+
+DATA;
+
+/* ------- UT ProjectSetup-1 ------------------------------------------------------------------- */
+#1 = IFCDIMENSIONALEXPONENTS(0, 0, 0, 0, 0, 0, 0);
+#2 = IFCDIRECTION((1., 0., 0.));
+#3 = IFCDIRECTION((0., 1., 0.));
+#4 = IFCDIRECTION((0., 0., 1.));
+#5 = IFCCARTESIANPOINT((0., 0., 0.));
+#16 = IFCPROJECT('2DAvEupIz0HQr73cMaawtY', $, 'GeoRef-4', 'An IFC file exchange with two different georeferencing meta data.', $, $, $, (#28, #68), #17);
+#17 = IFCUNITASSIGNMENT((#18, #19, #20, #24, #25, #26, #27));
+#18 = IFCSIUNIT(*, .LENGTHUNIT., $, .METRE.);
+#19 = IFCSIUNIT(*, .AREAUNIT., $, .SQUARE_METRE.);
+#20 = IFCSIUNIT(*, .VOLUMEUNIT., $, .CUBIC_METRE.);
+#22 = IFCSIUNIT(*, .PLANEANGLEUNIT., $, .RADIAN.);
+#23 = IFCMEASUREWITHUNIT(IFCPLANEANGLEMEASURE(0.017453292519943295), #22);
+#24 = IFCCONVERSIONBASEDUNIT(#1, .PLANEANGLEUNIT., 'degree', #23);
+#25 = IFCSIUNIT(*, .MASSUNIT., .KILO., .GRAM.);
+#26 = IFCSIUNIT(*, .TIMEUNIT., $, .SECOND.);
+#27 = IFCMONETARYUNIT('EUR');
+#54 = IFCDIRECTION((0.,1.));
+
+/* ------- UT SpatialStructure-1 --------------------------------------------------------------- */
+/* ------- IfcSite is the top most element in the spatial structure ---------------------------- */
+#32 = IFCSITE('27H$neCQf1NwtmczxBInPR', $, $, $, $, #33, $, $, .ELEMENT., $, $, $, $, $);
+/* ------- The IfcSite's placement is the top-most placement and uses the same ----------------- */
+/* ------- IfcAxis2Placement as IfcGeometricRepresentationContext does ------------------------- */
+#33 = IFCLOCALPLACEMENT($, #29);
+/* ------- Project/Spatial structure ----------------------------------------------------------- */
+#35 = IFCRELAGGREGATES('3Hu7f6BmT14B_XS9yS78Jr', $, $, $, #16, (#32));
+
+/* ------- UT GeoRef-4 ------------------------------------------------------------------------- */
+/* ------ IfcBuilding has two representations of its outline ----------------------------------- */
+#50 = IFCBUILDING('28H$neCQf1NwtmczxBInPR', $, $, $, $, #53, #40, $, $, $, $, $);
+#40 = IFCPRODUCTDEFINITIONSHAPE($,$,(#41,#81));
+/* ------ Spatial inclusion in the project ----------------------------------------------------- */
+#51 = IFCRELAGGREGATES('3Hu7f6BmT14B_XS9yS78Jq', $, $, $, #32, (#50));
+/* ------ Placement is relative to that of IfcSite according to the spatial structure ---------- */
+/* ------ The way it is modelled, there is no offset and no rotation. -------------------------- */
+#52 = IFCAXIS2PLACEMENT3D(#5, #4, #2);
+#53 = IFCLOCALPLACEMENT(#33, #52);
+
+/* ------- D48/GK ------------------------------------------------------------------------------ */
+#28 = IFCGEOMETRICREPRESENTATIONCONTEXT($, 'Model', 3, 1.E-6, #29, #54);
+#29 = IFCAXIS2PLACEMENT3D(#5, #4, #2);
+/* ------- ProjectedCRS provides information about the underlying geodetic --------------------- */
+/* ------- coordinate reference system --------------------------------------------------------- */
+#30 = IFCPROJECTEDCRS('EPSG:3912', 'MGI 1901 / Slovene National Grid', 'EPSG:3906', $, 'Gauss-Kruger', '5', #18);
+/* ------- MapConversion provides information about the global-to-local transformation --------- */
+#31 = IFCMAPCONVERSION(#28, #30, 430500., 137100., 511., 1., 0., 1., 1., 1.);
+/* ------- Representation of the building's outline: ------------------------------------------- */
+/* ------- Polyline with six points ------------------------------------------------------------ */
+#41= IFCSHAPEREPRESENTATION(#28,'Axis','Curve2D',(#42));
+#42= IFCPOLYLINE((#43,#44,#47,#48,#45,#46,#43));
+#43 = IFCCARTESIANPOINT((92.58,63.68));
+#44 = IFCCARTESIANPOINT((91.82,69.10));
+#45 = IFCCARTESIANPOINT((88.26,60.37));
+#46 = IFCCARTESIANPOINT((87.95,62.90));
+#47 = IFCCARTESIANPOINT((77.37,66.98));
+#48 = IFCCARTESIANPOINT((78.67,58.98));
+
+/* ------- D96/TK ------------------------------------------------------------------------------ */
+#68 = IFCGEOMETRICREPRESENTATIONCONTEXT($, 'Model', 3, 1.E-6, #69, #54);
+#69 = IFCAXIS2PLACEMENT3D(#5, #4, #2);
+/* ------- ProjectedCRS provides information about the underlying geodetic --------------------- */
+/* ------- coordinate reference system --------------------------------------------------------- */
+#70 = IFCPROJECTEDCRS('EPSG:3794', 'Slovenia 1996 / Slovene National Grid', 'EPSG:4765', $, 'Gauss-Kruger', '5', #18);
+/* ------- MapConversion provides information about the global-to-local transformation --------- */
+#71 = IFCMAPCONVERSION(#68, #70, 430200., 137600., 511.5, 1., 0., 1., 1., 1.);
+/* ------- Representation of the building's outline: ------------------------------------------- */
+/* ------- Polyline with six points ------------------------------------------------------------ */
+#81 = IFCSHAPEREPRESENTATION(#68,'Axis','Curve2D',(#82));
+#82 = IFCPOLYLINE((#83,#84,#87,#88,#85,#86,#83));
+#83 = IFCCARTESIANPOINT((92.58,63.68));
+#84 = IFCCARTESIANPOINT((91.82,69.10));
+#85 = IFCCARTESIANPOINT((88.26,60.37));
+#86 = IFCCARTESIANPOINT((87.95,62.90));
+#87 = IFCCARTESIANPOINT((77.37,66.98));
+#88 = IFCCARTESIANPOINT((78.67,58.98));
+
+
+ENDSEC;
+END-ISO-10303-21;
diff --git a/Georeferencing-4/Georef-4-OIP_separateModels.png b/Georeferencing-4/Georef-4-OIP_separateModels.png
new file mode 100644
index 00000000..a62b9837
Binary files /dev/null and b/Georeferencing-4/Georef-4-OIP_separateModels.png differ
diff --git a/Georeferencing-4/Georef-4-OIP_wrong.png b/Georeferencing-4/Georef-4-OIP_wrong.png
new file mode 100644
index 00000000..1a5a773f
Binary files /dev/null and b/Georeferencing-4/Georef-4-OIP_wrong.png differ
diff --git a/Georeferencing-4/readme.md b/Georeferencing-4/readme.md
new file mode 100644
index 00000000..cb6b2f1e
--- /dev/null
+++ b/Georeferencing-4/readme.md
@@ -0,0 +1,40 @@
+
+### Intent
+
+This scenario provides the outline of the house from Georeferencing-3 unit test in a single IFC file with different georeferencing:
+
+- D48/GK (EPSG:3912)
+- D96/TM (EPSG:3794)
+
+Both outlines should overlay with a height difference of 0.5 meter if interpreted correctly (up to a certain precision for the horizontal layout).
+
+**NOTE**: The produced IFC file is wrong according to the current specification. 
+These changes are needed:
+
+1. The constraint on the derived `HasCoordinateOperation` within `IfcGeometricRepresentationContext` has to be revised,
+ such that not *all* `HasCoordinateOperation` attributes in an IFC file must refer to an *identical* instance of `IfcCoordinateReferenceSystem`.
+1. A relaxation of the restriction of only one 3D and one 2D `IfcGeometricRepresentationContext` per IFC file is needed.
+
+With these changes, an IFC file as presented in this unit test can be produced. See also [official documentation of `IfcGeometricRepresentationContext`](https://standards.buildingsmart.org/IFC/RELEASE/IFC4/ADD1/HTML/link/ifcgeometricrepresentationcontext.htm).
+
+### Prerequisites
+
+This scenario builds upon following other scenarios:
+
+- Georeferencing-3
+
+### Content
+
+This scenario covers the following additional concepts and/or IFC entities:
+
+- multiple different georeferencing in single IFC file
+
+### Supporting files
+
+Following files correspond to this scenario:
+
+| Filename                          | Description                               |
+|:----------------------------------|-------------------------------------------|
+| `GeoRef-4.ifc`                    | the building's outline as IFC file        |
+| `GeoRef-4-OIP_wrong.png`          | screen shot of IFC file loaded in TUM Open Infra Platform - interpreted wrongly |
+| `GeoRef-4-OIP_separateModels.png` | screen shot of IFC file loaded in TUM Open Infra Platform - interpreted as two separate models |