Auto Cash Receipts - R03B50D and R03B50E not matching any receipts

We are implementing Auto Cash receipts and were not able to match on known invoice with or without amounts (R03B50D & R03B50E). We populated the F03B13Z1 with Customer AN8, ALPH, Doc No (Invoice No), Receipt Amount and Amount Applied, as well as other fields such as the customer bank information and receipt number. The Execution List called for R03B50D, R03B50E, R03B50A, R03B50B & R03B50F to be executed in that order. Receipts were matched only with R03B50B or R03B50A, even though in most cases we had the invoice number and an exact amount match, and the AN8.  Does anyone have any