Cash desk and payment lots documents not updating in DFKKOP table

Dear Experts,

I have noticed that my cash desk payments and payment lot documents are not getting updating in the DFKKOP table. I have identified that for this documents, the document class is updated with "1" which means "Document does not have FI-CA items".

But, the postings where shown in the FPL9 transactions and clearing is happening as per the settings and requirements.

So please update me, on what basis the system would determine the document class for the document types in contract accounting..

Your inputs on this issue will be really helpful for me.

Thanks

Aditya Viswanath