I am using RFA
Need to PostMsg to update existing Item
I am sure this is existing, but when I post msg on it.
It always return  Unknown Item. Ref. the image
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The answer has been posted in this question.
If you ensure that this JPY3MFSPD=TFCB does exist in the ATS server, please check the following bullets:
Is it possible to get an ack message when submitting a respMsg with a non interactive provider with RFA?
POST Update does not clear fields
RFA Post Msg update data Error
OMM Post message A29 post message did not contain permission data
Post Id must exist for multiple part post message