The functions are older pro_develop functions: In your Toolkit Wizard
just search for "relations"
status = prodb_export_relations(wrelfile, mdl, -1);
status = prodb_import_relations(wrelfile, mdl, -1, FALSE);
If there are errors in the relations that you are trying to reload,
they will not come in. Likewise if there are errors in the models
existing relations, and you try to add to them, the function will fail.