When a message does not run successfully, you can troubleshoot the related source document and target document.
When a document is used in a message run, based on the document setup, a query is created that reads the data.
You have several options to troubleshoot a document. You can, for example:
Validate the document setup.
Test a document.
Common issues on the document are:
No files are read from the Work folder: Check the read settings on the document header.
Missing data in export: Verify the setting of these fields on the record setup: 'Join mode' and 'Combine with parent record'. For more information, refer to this blog.
No records are processed: Verify the range as set up for document records.