| ERROR | (XSMXAGGR25) Relation workspace object must be a one-dimensional self-relation to be used as a weight for AGGREGATE. |
| CAUSE | The user specified an illegal relation as a weight. The relation might have been multidimensional, not a self-relation, or not a relation over one of the bases of the aggregation variable. |
| ACTION | Specify a valid self relation over one of the bases of the aggregation variable. |