You assign the same insurance grouping to all payroll units with the same conditions for contribution calculation.
This grouing enables you to access the view V_T5CS7, in which the contribution rates and maximum wages for each insurance type are entered according to time dependency (represented by an application key).
By grouping insurances you determine the contribution amounts and the limits; in contrast, the social security grouping determines whether the subcomponents need to be calculated, and which wage types are relevant.