The {2} expression for the {0} '{1}' specifies multiple incompatible scopes in the same aggregate expression. Nested aggregates ...

The {2} expression for the {0} '{1}' specifies multiple incompatible scopes in the same aggregate expression.  Nested aggregates cannot specify multiple peer groups and cannot specify both child groups and nested data regions.  The scopes for all nested aggregates must be the same as, a parent of, or a child of the scopes all other nested aggregates in the same expression.