Improper Use of conversion &1 for field &2.

What causes this issue?

Conversion option &V1& is not allowed to be used in conjunction with
field &V2&.

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?

Contact your system administrator.

Procedure for System Administrators

Find the incorrect entry in <LS>Personnel Administration</> customizing
under "<DS:SIMG.OHIX0635>Define infotype header</>", view <LS>Header
Structure per Infotype</> and correct the entry.

Error message extract from SAP system. Copyright SAP SE.