Clarification on the Text when Rejecting messages with Invalid Party IDs

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Imported from previous forum

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Hi all,

This is to get a clarification on the text sent to the user when rejecting messages with invalid party IDs.

Does the text need to mention the specific party role the ID relates to? For example, if the entered party role is Trader Mnemonic, does the reject text need to mention ‘invalid trader mnemonic?’.

Or is it simply enough to say ‘invalid party ID’?

Does the FIX guidelines mention anything specific on this?