RosettaNet Inbound Validation

I am on v6.1 platform, Rnet 6.0.1

I’ve configured the TPA in the fulfiller side of a Pip not to validate documents- (Validate Output -NO). However the Pip implementation still validates the inbound RNO and sends an exception document instead of Receipt Ack.
What is missing here not to validate the inbound RNO and send a ReceiptAck.

Thanks much