SELECT lsmb__grant_perms('orders_generate', obj, ptype)
  FROM unnest(array['oe'::text, 'orderitems', 'business_unit_oitem']) obj,
       unnest(array['SELECT'::text, 'INSERT', 'UPDATE']);

vs

SELECT lsmb__grant_perms('sales_quotation_create', obj, ptype)
  FROM unnest(array['orderitems'::text, 'business_unit_oitem']) obj
 CROSS JOIN unnest(array['INSERT'::text, 'UPDATE']) ptype;