I need a create constraint where @root.id is member of a 'XXXX' Group on table ca_contact, somebody can help me with this?
Not sure what is the exact requirement but I wonder if you are looking after the group list object and the members attached to a particular group i.e. assignee.[group]group_list.member IN (@root.id) which is aligned with call_req table.
You may find additional examples and information in regards to the store queries in the below documentation.
What exactly are you attempting to achieve with the constraint?
Retrieving data ...