Processing of source transaction canceled due to serious error in &1

What causes this issue?

A serious error occurred during processing of source transactions.

System Response

Processing of source transactions is terminated.

How to fix this error?

Correct the inbound data that contains errors. You can find more
detailed information about the errors that occurred in the previous
messages.

Procedure for System Administrators

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

Error message extract from SAP system. Copyright SAP SE.