drop non existent capital asset items

DELETE
FROM
PUR_PO_CPTL_AST_ITM_T
WHERE
CPTL_AST_ITM_ID IN (
  SELECT
  aitm.CPTL_AST_ITM_ID
  FROM
  PUR_PO_CPTL_AST_ITM_T aitm
  left outer join pur_po_itm_t pitm ON
  aitm.FDOC_NBR = pitm.FDOC_NBR
  AND
  aitm.PO_ITM_ID = pitm.PO_ITM_ID
  WHERE
  pitm.FDOC_NBR IS NULL
)