I copied the Logic from rep101.php and it worked.
function get_open_balance($supplier_id, $to)
{
if($to)
$to = date2sql($to);
$sql = "SELECT SUM(IF(t.type = ".ST_SUPPINVOICE." OR (t.type IN (".ST_JOURNAL." , ".ST_BANKDEPOSIT.") AND t.ov_amount>0),
-abs(t.ov_amount + t.ov_gst + t.ov_discount), 0)) AS charges,";
$sql .= "SUM(IF(t.type != ".ST_SUPPINVOICE." AND NOT(t.type IN (".ST_JOURNAL." , ".ST_BANKDEPOSIT.") AND t.ov_amount>0),
abs(t.ov_amount + t.ov_gst + t.ov_discount) * -1, 0)) AS credits,";
$sql .= "SUM(IF(t.type != ".ST_SUPPINVOICE." AND NOT(t.type IN (".ST_JOURNAL." , ".ST_BANKDEPOSIT.")), t.alloc * -1, t.alloc)) AS Allocated,";
$sql .= "SUM(IF(t.type = ".ST_SUPPINVOICE.", 1, -1) *
(abs(t.ov_amount + t.ov_gst + t.ov_discount) - abs(t.alloc))) AS OutStanding
FROM ".TB_PREF."supp_trans t
WHERE t.supplier_id = ".db_escape($supplier_id);
if ($to)
$sql .= " AND t.tran_date < '$to'";
$sql .= " GROUP BY supplier_id";
$result = db_query($sql,"No transactions were returned");
return db_fetch($result);
}
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