Address comments

Signed-off-by: JeffMboya <jangina.mboya@gmail.com>

Author: JeffMboya

domains/service.go

@@ -367,7 +367,8 @@ func (svc *service) RoleRemoveMembers(ctx context.Context, session authn.Session
 			return errors.Wrap(svcerr.ErrViewEntity, err)
 		}
 		if membersPage.Total <= uint64(len(members)) {
-			return errors.Wrap(svcerr.ErrRemoveEntity, err)
+			errAtLeastOneMemberRetain := errors.New("at least one member should be in built-in role")
+			return errors.Wrap(svcerr.ErrRemoveEntity, errAtLeastOneMemberRetain)
 		}
 	}
 
@@ -392,7 +393,8 @@ func (svc *service) RoleRemoveAllMembers(ctx context.Context, session authn.Sess
 			return errors.Wrap(svcerr.ErrViewEntity, err)
 		}
 		if membersPage.Total > 0 {
-			return errors.Wrap(svcerr.ErrRemoveEntity, err)
+			errAtLeastOneMemberRetain := errors.New("at least one member should be in built-in role")
+			return errors.Wrap(svcerr.ErrRemoveEntity, errAtLeastOneMemberRetain)
 		}
 	}