Payment Lock at CA not working

Hi Experts,

I have a requirement where I need to block the payments coming from EBS via FPB7 and also by Payment lot via FP05 by putting an incoming payment lock at CA level.

I have created locks in customizing Financial Accounting->Contract Accounts Receivable and Payable->Business Transactions->Payments->Incoming/Outgoing Payment Creation->Define Payment Lock Reasons.

and Financial Accounting->Contract Accounts Receivable and Payable->Postings and Documents->Basic Settings->Define Lock Reasons for Posting Locks (Clearign lock only).

However when I am trying to post a payment lot, the amount is posted and cleared with open items on account. I need to avoid this.

I was told to create ZFM for event 259, but I doesnt gets triggered. Can someone help me on which event should be configured to avoid payment via FPB7/FP05 and move it to clarification worklist.

Thanks in advance.

Regards,

Priyanka