Co.code &, trans. &: Percentage rate and/or amount incorrect

What causes this issue?

In the transferred data record, either both fields (percentage rate and
amount) or neither of the fields was filled. This is not permissible.
You need to specify exactly one of these fields.

System Response

The transaction has been marked as containing errors and cannot be
processed.

How to fix this error?

Correct the erroneous data record.

Error message extract from SAP system. Copyright SAP SE.