Example:
Funcation pqty(stock.code) calculates a value of 0 for a particular product. This fails the last CASE that makes sure the pqty() value is greater than our Usage Rate * Review Cycle – in this case is 3. But that is less than our Minimum Order Qty (First CASE) and not a multiple of our Box Qty (Second CASE)
Another example could be that pqty() calculates less than the Minimum Order Qty (fails first CASE) so we raise it to the Minimum Order Qty, but that new value could fail either or both of the second CASE's.
Minimum Order Qty = stock.purchase_unit
Box Qty = stock.box_qty
I guess a better way to word it is that because pqty() returns a calculated value each time and I can't take that value and assign it to a variable, then use that variable. If I was writing VB or similar I'd want something like:
intPurchaseQty = pqty(stock.code)
CASE WHEN intPurchaseQty < stock.purchase_unit THEN intPurchaseQty = stock.purchase_unit
WHEN MOD(intPurchaseQty, stock.box_qty) > 0 THEN intPurchaseQty = stock.box_qty * ROUND(CAST(intPurchaseQty AS DOUBLE PRECISION) / stock.box_qty)
WHEN intPurchaseQty < (urate(stock.code) * creditors.review_cycle) THEN intPurchaseQty = urate(stock.code) * creditors.review_cycle
END
COLUMN = intPurchaseQty AS "pqty",
I hope that makes it a lighter shade of mud!!