RULE product_requires_category

(* SCHEMA technical_data_packaging; *)

  RULE product_requires_category FOR (product, 
             product_related_product_category);

  WHERE
    wr1: (SIZEOF(QUERY ( p <* product |
    (SIZEOF(USEDIN(p,'TECHNICAL_DATA_PACKAGING.'+
            'PRODUCT_RELATED_PRODUCT_CATEGORY.PRODUCTS')) 
             = 0) )) = 0);

  END_RULE; -- product_requires_category

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