Mat. group assignment takes place independently of communication profile

What causes this issue?

The communication profile (POS outbound profile) of the assortment
defines whether all material groups may be sold there or only those
defined in the plant/material group master.

System Response

This profile is taken into account when you attempt to list value-only
materials, so that only those value-only materials defined in the plant
master will be listed.

How to fix this error?

If you set this flag, this profile will be ignored. All material groups
that exist will be listed in the assortments you have selected.

Error message extract from SAP system. Copyright SAP SE.