BPCUI0516W The selected subgroups cannot be removed from the general group because they cannot be moved up a level in the groups hierarchy due to name conflicts with the general groups at the higher level.

Explanation

When you remove a subgroup from its parent general group, the subgroup is moved up to the same level in the hierarchy as the parent group. If the subgroup has the same name as an existing general group at the higher level, the subgroup cannot be moved up. The subgroup is not removed from the general group.