Enter a hypothetical derivative number (between &1 and &2)

What causes this issue?

The system couldn't find a valid hypothetical derivative number.
The reason could be
the hypothetical derivative number is not entered by the user
the hypothetical derivative number entered is not within the limits
specified in the number range

System Response

System throws an error message

How to fix this error?

Enter a valid hypothetical derivative number within the range.

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.