Special rule &2 is not allowed

What causes this issue?

You entered special rule &V2& for insurance type &V1&.
However, the special rule is only allowed for a partial interval of the
infotype record. It is not allowed in the period from &V3& to &V4&.

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?

You can either modify the validity range of the infotype record to use
the special rule or choose a different special rule.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.