Cause

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This occurs when the Connector attempts to process magento.inventory.source_management messages. The Connector attempts to process these messages as if they were a magento.inventory.source_stock_management.update message which does require a mode value. Because there is no mode in the magento.inventory.source_mangement messages, the error occurs.

Solution

To resolve the problem run the following SQL statement in the CLI which deletes all records in the mcom_api_messages table:

delete from mcom_api_messages;

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