SAP PO: Empty Request Payload (REST to RFC)

[ZTK196]

Hi,

There is a requirement to send the request based from URL query params and map it to the target field via UDF, this is already working however I don't see any way to send empty payload as it is still looking for the source payload in Dummy Message Type even if it's not mapped to the target. If I add it it's working if not, I'm getting the following error response:

but If I added the source payload of the dummy message type it is working, although it's only dummy - it seems like it still requires it.

Can you anyone share what approach I can do to achieve the empty request payload?

Thank you!