CASE WHEN OL.OL_STATUS >= 3 THEN 0 ELSE CASE WHEN OL.OL_TERM_DATE < > '1901-01-01' AND GETDATE() > OL.OL_TERM_DATE THEN 0 ELSE CASE WHEN b.BookedQty IS NULL THEN OL.OL_NEGOT_QTY ELSE CASE WHEN b.BookedQty > OL.OL_NEGOT_QTY THEN 0 ELSE OL.OL_NEGOT_QTY - b.BookedQty END AS [Remaining Blanket Qty],Thanks