Balance Sheet: Accounts Payable

When listing the accounts payable line item in the Balance Sheet - What if at the point when preparing the report I still don't know the amount of the outstanding invoices that my vendors will be issuing. It happens in my case as the invoices are based on the previous cycle performance/consumption and only few weeks into the following month the various vendors issue the invoice. During the waiting time I can not tell and/or estimate the final number.
What should I do in such scenario?