oooh thats great thunder now it aint a bug no more theyre hidden features
, and besides that whether or not it was in the manual aslong as you get the message that youre at the limit by doing the normal way just donate from you too fund without this or that way donations then you know its not right.
and afaik if you have 20 mil in the fund and donate 6 mil itll leave 1 mil that is not donated to the fund dont know if it says something or not maybe try looking a bit upwards in some small line prolly says it somewhere.