POS Restrict Zero Quantity

Selling items that are not in stock causes negative inventory and unhappy customers. This module checks product quantities when the cashier presses Pay and refuses the sale if stock is zero or below. It adds one option to the POS configuration and plugs into Point of Sale and Inventory quantities. Shop managers keep stock figures accurate.

1. 1

   Enable the restriction

   In the POS configuration the manager ticks Restrict Zero Quantity. The setting is also available in Settings.

   • Field: Restrict Zero Quantity
   • Per POS
2. 2

   Sell as usual

   The cashier adds products to the order. The module reads each product stock quantity from the POS data.

   • Uses on-hand quantity
   • Applies to storable products
3. 3

   Pay is intercepted

   On Pay the patched _onClickPay checks the lines. If any product has zero or negative stock the restriction flag is raised.

   • Check before payment
   • Compares quantity with the order
4. 4

   Sale denied

   A popup titled Zero Quantity Not allowed or Deny Order names the product and stops the payment. The cashier removes the item or adjusts stock.

   • Popup with product name
   • Payment blocked
   • Fix stock in Inventory

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