IHC Inbound PAYEXT idoc error: A transaction type could not be (uniquely) determined

Hi,

I am trying to create a EXTPAY Transaction Type in IHC

Below is the step by step:

1. FB60 - Post Vendor invoice

2. F110 - Post payment via EDI Payment method A

3. WE02 - Inbound IDOC EUPXR and PAYEXT successfully generated with green status

                Outboud IDOC PAYEXT generated but failed with status 51: A transaction type could not be (uniquely) determined

I have configured only 1 entry in below config path:

IHC> Account Management > Payment Processes in In-House Cash >Define Transaction Type for Automatic Payments

Bank Area     T/D                 Delivery Pymt Mtd     Transaction Type

IHC              Bank Transfer              A                    EXTPAY

Please share your thoughts why system is unable to identify the transaction type.

Cheers,

J