I received the same error today while transferring some ledger transaction data to a third party application. After a lot of investigation, I found the Endpoint -> Action policy setup was wrong. The EndPoint created for the ledger transfer was correct. But, the same service was wrongly selected in an EndPoint created for Item transfer. Very silly mistake. Transfer started working when I removed the related service from Item transfer related EndPoint. I really wish if AX could give more specific errors. This might not be your issue. But, I am updating here in case this extra information will help anyone.
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