+function add_overhead_cost($stock_id, $qty, $date_, $costs)
+{
+ if ($qty != 0)
+ $costs /= $qty;
+ $sql = "SELECT overhead_cost FROM ".TB_PREF."stock_master WHERE stock_id = '$stock_id'";
+ $result = db_query($sql);
+ $myrow = db_fetch($result);
+ $overhead_cost = $myrow['overhead_cost'];
+ $qoh = get_qoh_on_date($stock_id, null, $date_);
+ if ($qoh + $qty <= 0)
+ $overhead_cost = 0;
+ else
+ $overhead_cost = ($qoh * $overhead_cost + $qty * $costs) / ($qoh + $qty);
+ $sql = "UPDATE ".TB_PREF."stock_master SET overhead_cost=$overhead_cost
+ WHERE stock_id='$stock_id'";
+ db_query($sql,"The cost details for the inventory item could not be updated");
+}
+
+function add_labour_cost($stock_id, $qty, $date_, $costs)
+{
+ if ($qty != 0)
+ $costs /= $qty;
+ $sql = "SELECT labour_cost FROM ".TB_PREF."stock_master WHERE stock_id = '$stock_id'";
+ $result = db_query($sql);
+ $myrow = db_fetch($result);
+ $labour_cost = $myrow['labour_cost'];
+ $qoh = get_qoh_on_date($stock_id, null, $date_);
+ if ($qoh + $qty <= 0)
+ $labour_cost = 0;
+ else
+ $labour_cost = ($qoh * $labour_cost + $qty * $costs) / ($qoh + $qty);
+ $sql = "UPDATE ".TB_PREF."stock_master SET labour_cost=$labour_cost
+ WHERE stock_id='$stock_id'";
+ db_query($sql,"The cost details for the inventory item could not be updated");
+}
+
+function add_issue_cost($stock_id, $qty, $date_, $costs)
+{
+ if ($qty != 0)
+ $costs /= $qty;
+ $sql = "SELECT material_cost FROM ".TB_PREF."stock_master WHERE stock_id = '$stock_id'";
+ $result = db_query($sql);
+ $myrow = db_fetch($result);
+ $material_cost = $myrow['material_cost'];
+ $qoh = get_qoh_on_date($stock_id, null, $date_);
+ if ($qoh + $qty <= 0)
+ $material_cost = 0;
+ else
+ $material_cost = ($qty * $costs) / ($qoh + $qty);
+ $sql = "UPDATE ".TB_PREF."stock_master SET material_cost=material_cost+$material_cost
+ WHERE stock_id='$stock_id'";
+ db_query($sql,"The cost details for the inventory item could not be updated");
+}
+