SAP Message 4B090 - Mismatch between Tax Status and Dependant Information.

Diagnosis
There is a mismatch between Related Person information in'Family/Related Persons' Infotype (0021) and Employee Tax Status.

Procedure
For Employee with Tax Status 'HF' - Head of Family, create only onerecord in Infotype 'Family/Related Persons' (0021) and mark the RelatedPerson as 'Other Dependant'.