Customer Open Item Clearing

Hello,

I have a billing document with Installment Payment term. Hence the billing related accounting document has 'N' number of split lines due to installments, each falling due on different dates.

During Clearing, I have configured OB74 for Open Item clearing on XBLNR and WRBTR fields.

A receipt is received from customer clearing line item 1 of the accounting document as it is earliest due and hence paid.

System does not clear the Receipt V/s Billing Accounting document line item 1. F.13 does not report any errors as well.

How to achieve auto clearing. Please clarify.

Thanks

Bala