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RFC Lookup in SAP PO Graphical Mapping returning null values

There is a standard function module "RFC_READ_TABLE" in SAP ECC. SAP PO needs to perform a RFC Lookup to this function module/RFC and fetch the data from SAP ECC table "BKPF" and field "XBLNR".

I have performed the below steps in SAP PO for RFC Lookup:
  • Have imported the RFC structure "RFC_READ_TABLE" under the SWCV
  • Have created the parameter "RFC_Channel" under the Signature tab of Message Mapping
  • In Graphical Mapping RFC Lookup, I have selected "RFC_Channel" under Communication Channel and have selected the imported RFC "RFC_READ_TABLE"
  • In Operation Mapping, I have created the parameter and have done the Binding with message mapping parameter.
  • In ICO, under Receiver Interfaces tab I have provided the RFC channel to the operation mapping parameter.

Have attached the screenshot of the configuration.

Can you please help what I'm missing.

Communication channel logs also has been attached.

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