SAP Payment Engine - Buffer Issue?

[#1]

Hi All

In SAP Payment Engine, we are having statements coming in for various PO types.

Since the frequency of the statements is too many in a short span of time, incorrect transaction types are being determined for handful of accounts (1 in 10). The transaction type determination class->method is a custom one and the E&V checks are also newly created. Each PO type has a different E&V check to refer to this is getting mixed up.

Could this be a buffering issue? If so, where do I need to clear the buffer and via which FM in payment engine? The control should not go in the custom class->method for transaction type determination.

Thanks in advance.