Cahs desk payment error

Hi Experts,

I am facing a peculiar problem.When payment is posted using Cash Journal (FPCJ) the open items does not get cleared if payment is received in cashbefore the due date of open item- it gets posted as an on account payment. On the contrary, when the payment is received thru check before due date then the open item gets cleared.

When payment is posted using cash on or after due date of open item then it gets cleared.

I have assigned the same clearing variant for payment types in Open Item Management > Clearing Control > Define Specifications for Clearing Types >Define Defaults for Incoming Payments

19 Cash Desk: Payment

20 Cash Desk: Payment by Card

21 Cash Desk: Payment by Check

Please advise

Thanks & Regards

Satyajeet