Employee group & contradicts professional status & or SI key &

What causes this issue?

A contradiction between infotypes 0013 (Social Insurance) and 0020
(DEUEV) was detected in period &V4&.
The combination of person group key &V1&, occupational status &V2&, and
official SI key &V3& (from infotype 0013) is not allowed according to
annex 15 of DEUEV.

How to fix this error?

Use a permissible value in the "Person Group" field or change the values
of the SI key or the "Occupational Status" field.

Error message extract from SAP system. Copyright SAP SE.