How to process a receipts that nets to zero using Standard Receipts Entry_P03B102

The F03B11 displays 3 open invoices and credit memo where the open amount (AAP) nets to zero. The load and select only displays the positive RI pay items and not the RM which nets the transaction to zero. Reviewing the customer ledger the two RI's were short paid leaving an open amount. 1) Why will the system not load all open items 2) What is the suggested process to match the open credit memo against the 2 open invoices using P03B102. 3) What is the suggested process to close out the open F03B11 records. Thank you