Consider a situation where you send invoices to several related companies, where the parent company ultimately pays the invoices.

In the Payment Reconciliation screen, you can apply a cash receipt to only one company's invoices. If you try to apply part of the cash receipt to an invoice from a second company, you get an error message that informs you that you've already applied cash against invoices from a different company. I suppose this design decision was meant to keep users from mis-applying cash, but this approach is poorly reasoned. This doesn't take consolidated disbursements from a parent company into consideration.

This "error message" should actually be no more than a warning message. Alternatively, a set-up parameter in either "Sales and Receivables Setup" or "General Ledger Setup" should allow for posting a cash receipt in the (Payment Reconciliation screen) to invoices from multiple customers.