Trying to solve one puzzle and can not find any standard functionality that can be useful. The idea is to include uposted document (neither received neither invoiced) lets say Purch. Invoice into "accounting". This would be kind of "temporary" information until document is finished (dimensions, actual document lines, they may differ from initial lines but amount should not change) to have information about debt to customer as example.
Only standard functionality is interesting in this case.
Maybe i am missing something but all i can think of is based on different ledgers.