-1, 1) * (ov_amount + ov_gst + ov_freight + ov_freight_tax + ov_discount),0)) as cur_credit
FROM ".TB_PREF."debtors_master cust
LEFT JOIN ".TB_PREF."debtor_trans trans ON trans.type!=".ST_CUSTDELIVERY." AND trans.debtor_no = cust.debtor_no,"
-1, 1) * (ov_amount + ov_gst + ov_freight + ov_freight_tax + ov_discount),0)) as cur_credit
FROM ".TB_PREF."debtors_master cust
LEFT JOIN ".TB_PREF."debtor_trans trans ON trans.type!=".ST_CUSTDELIVERY." AND trans.debtor_no = cust.debtor_no,"