▁data ▁exports . ▁Data ▁imports ▁and ▁exports ▁performance ▁can ▁be ▁checked ▁with ▁the ▁following ▁steps : ▁ ▁Cross - check ing ▁of ▁the ▁data ▁properties ▁within ▁the ▁Integr ation ▁layer ▁with ▁technical / bus iness ▁specification ▁documents . ▁ ▁For ▁web ▁service ▁invol vement ▁with ▁the ▁integration ▁layer , ▁W SD L ▁and ▁X SD ▁can ▁be ▁used ▁against ▁web ▁service ▁request ▁for ▁the ▁cross ▁check . ▁ ▁Middle ware ▁invol vement ▁with ▁the ▁integration ▁layer ▁allows ▁for ▁data ▁ma ppings ▁against ▁middle ware ▁logs ▁for ▁the ▁cross ▁check . ▁ ▁Exec ute ▁some ▁unit ▁tests . ▁Cross ▁check ▁the ▁data ▁ma ppings ▁( data ▁positions , ▁declarations ) ▁and ▁requests ▁( character ▁length , ▁data ▁types ) ▁with ▁technical ▁specific ations . ▁ ▁Investig ate ▁the ▁server ▁logs / middle ware ▁logs ▁for ▁troubles ho oting . ▁ ▁Reading ▁knowledge ▁of ▁W SD L , ▁X SD , ▁D TD , ▁XML , ▁and ▁E DI ▁might ▁be ▁required ▁for ▁this . ▁ ▁Data ▁state ▁within ▁the ▁database ▁layer ▁ ▁System ▁integration ▁testing ▁of ▁a ▁database ▁layer ▁might ▁proceed ▁as ▁follows : ▁▁ ▁First ▁check ▁whether ▁all ▁the ▁data ▁have ▁committed ▁to ▁the ▁database ▁layer ▁from ▁the ▁integration ▁layer . ▁ ▁Then ▁check ▁the ▁data ▁properties ▁with ▁the ▁table ▁and ▁column ▁properties ▁with ▁relevant ▁to ▁technical / bus iness ▁specification ▁documents . ▁ ▁Check ▁the ▁data ▁valid ations / const ra ins ▁with ▁business ▁specification ▁documents . ▁ ▁If ▁there ▁are ▁any ▁processing ▁data ▁within ▁the ▁database ▁layer ▁then ▁check ▁St ored