Instead of end day & the character string & was found.

What causes this issue?

An error occurred during the attempt to determine the field content.
Instead of the field content and end tag &v1&, the field content was
found with the incorrect tag &v2&.

System Response

The file cannot be processed.

How to fix this error?

Correct inbound file &v3&.

Error message extract from SAP system. Copyright SAP SE.