Grouper & is not defined

What causes this issue?

You have entered a contract grouper that does not exist in the system.

System Response

The system issues a warning.

How to fix this error?

Define the grouper in the IMG activity <DS:SIMG.OHIEGCB>Define contract
groupers</> you will find in the personnel administration
implementation guide under Payroll data, Contract management chapter.

Error message extract from SAP system. Copyright SAP SE.