RFA PostMsg Error

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 [500] Unknown Item. Ref. the image

Please Help!!

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If you ensure that this JPY3MFSPD=TFCB does exist in the ATS server, please check the following bullets:

Can you subscribe to the same item name from the same service? If this item doesn't exist either, you may get a "Record could not be found" message.
Can you check the name value (JPY3MFSPD=TFCB) used in the posting application whether it contains a space character or any special invisible/hidden character or not?

The answer has been posted in this question.