Basic run (data import) has already been executed for &1

What causes this issue?

The upload has already been carried out for this evaluation procedure
and date. To make any changes to the uploaded data (reversals,
retrospective postings), use the corresponding functions.

System Response

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

How to fix this error?

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.