Leave rule for leave accrual (&1 &2 key date &3) not found

What causes this issue?

An absence quota with the attribute GB "Contractor: Standard Leave -
Accrual with Employment Days" is missing in the view V_T5DTM_BAU.

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?

Check whether the attributes of the absence quotas for the leave accrual
have been assigned correctly in the view V_T5DTM_BAU "Attributes for
Absence Quota Types for IT 2006", and assign them if necessary.

Procedure for System Administrators

Error message extract from SAP system. Copyright SAP SE.