Non-numeric entry &1 for numeric argument.

What causes this issue?

The system expects a number and not &V1&.

System Response

How to fix this error?

Inform 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.