F110 - Payment created successfully but accounting entry not posted

Hello Experts,

I am executing F110 for open invoices and open downpayment request.

I am able to successfully create payment run. It is giving message:

Posting orders: 45 generated, 24 completed. It means accounting entry is posted only for 24 payment run.

I want to know, what would be the reason for successful 45 payment runs but accounting entry is not posted for 21 (45 - 24).

Note: These 24 successful entries are in sequence. There might be error while posting entry in 25th vendor. Please help me and let me know what would be reason.

Please help.

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Meenu