Lockbox matching to sales order # is throwing a mismatch error and creating on account reciepts

Hi AR team,

We are using lockbox functionality to create receipts and application.

Lockbox is setup to match receipts with sales order number and we are populating matching number in AR invoice header Sales order number field. And we don't have Order Management in our Oracle suite.

When we execute quick cash application program, it is throwing an error  i.e. invalid matching record and receipts are created as unidentified.

Error message: "This remittance includes these invalid matching numbers"

Program is able to apply to right invoices when we provide invoice numbers in data file and set up is still match to sales order.