No. That metadata is coming from your data base and, because the column doesn't have PK/FK defined for it, it is getting assigned a usage of measure. It's just like FM and Cube Designer. If you imported your data base into them you would see similar results. In general columns which participate in RI (either as pk or fk) will be marked as identifiers. Columns which are text or datetime are attributes. Numeric data type columns are the tricky ones. Are they measures? Are they attributes? Or are they identifiers without pk/fk defined in the underlying data base, which I think was your case.
Any module created using your module will have the usage which you have assigned to the query item.
After importing metadata you ought to inspect the results to confirm that every query item has been assigned a usage which conforms with your understanding of role of its source column. You ought to correct any miss-assignment.