Deposit module problem when Cash flow assignment is mandatory

Hi all SAP practitioners/experts,

Kindly check attached screenshot.

I have encountered this problem when adding a Deposit document after incoming payment - check payment means.

The incoming payment uses a checks clearing account which is not cash flow relevant.

Also, I don't want to set 'Optional' in the General Settings>Cash Flow tab because it wouldn't serve the purpose of setting cash flow relevant accounts to be assigned in a cash flow item/primary form item

How could I add this document and still manage to assign a cash flow line item in the deposit details? Is it therefore a bug or not?

FYI. I'm currently using SAP 8.82 PL11 and MSSQL 2008 R2.

Hoping for your feedback soon guys. Thanks!