Dear Eduardo,
I'm trying to understand your query above, but I’m confused with your below statement:
"Basically, I'm posting an account payable but still don't know which vendor I must pay in
this moment. FB50"
As per your explanation this is not the system issue, actually you are not following the appropriate process, e.g. if you don't know the vendor, and you must want to pay, which is strange.....
In practical if you don't know the vendor, it’s the situation of Accrued expense: expense is recognized before cash is paid out.
Accrued expense is a liability whose timing or amount is uncertain by virtue of the fact that an invoice has not yet been received. The uncertainty of the accrued expense is not significant enough to qualify it as a provision. An example of an accrued expense is a pending obligation to pay for goods or services received from a counterpart, while cash is to be paid out in a latter
accounting period when the amount is deducted from accrued expenses.
For monthly reporting you have to show this expense, for the month its belongs, so in this case I would suggest use SAP standard functionality Accrual/Deferral and book this entry at month end by T.Code: FBS1, e.g. reporting month is May, then post this entry posting date May 31,2014 and give reversal date 1st of June 2014.
FBS1:Posting Date: 31-04-2014
Debit Expense XXXX
Credit Accrued Expenses (B/S GL) XXXX
Reversal 1st day of June: 01.06.2014
Execute T.Code F.81 1st day of June, you can schedule it also, then system will read the reversal date form original accrual document and post the following entry.
Debit Accrued Expenses (B/S GL) XXXX
Credit Expense XXXX
Later on you when received actual invoice, let’s say on 25th of June you received the vendor invoice:
T.Code FB60
Debit Expense XXX
Credit Actual Vendor
Then make payment by F.53 or F110, in this way you will have track of your expenses, AP and FM reporting, and I hope there shouldn't be any problem at all, as long as it won't exceed your budget.
Kind Regards
Javed