Problem with factions relation commands

[stelioshah]

A player in my server found out that if a faction allies another faction and the invited faction accepts the request, if later on the alliance ends and the factions get another tag (neutral, enemies or truce), then one of the factions envolved can force alliance without the other faction getting an accept request again. Do you have any ideas on how to fix this?
For example. If Faction A uses /f ally B and then faction B accept the alliance. If later either faction uses the /f enemy/neutral/truce to the other faction, then either faction can force alliance by using /f ally A/B without the corresponding faction needing to respond the alliance. It is a really annoying feature and can cause huge faction griefs!