Field &1&2 is not an input field

What causes this issue?

A transaction is processed using batch input.

System Response

The runtime error field xxx occurs (invalid entries)

How to fix this error?

Correct the batch input data. Depending on the processing scenario, this
can affect either of the following objects:

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

,,Batch input session
,,CATT procedure
,,Application program

Error message extract from SAP system. Copyright SAP SE.