Error during data conversion: record &1 was anticipated but &2 was read

What causes this issue?

As the transferred data was being converted from the flat structure
BAPI_COPA_DATA into the internal structure, the system detected some
inconsistencies. The field RECORD_ID (record number) did not contain
the anticipated value.

System Response

No data records were written to the database.

How to fix this error?

Check whether the fields you have entered in the field list correspond
exactly to those in the flat structure BAPI_COPA_DATA.

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.