To allow Collums to deduct stock on sale, first, activate the function.
Activate stock control
Go to Admin>Settings>Product Stock
If you select to "Allow stock control", Collums will deduct from the stock count each time you sell a product. If the stock count = 0, the product will NOT be available to add to an invoice in the POS.
Selecting "Allow negative stock" will ensure that your products are always available to be sold regardless of their stock count. This is useful if you wish to sell a product that you will then order in for the patient.
These options can be set by clicking on product category or at the Organisation level at Admin>Organisation Settings>Product Stock.
In addition to activating this feature as described above, you must also ensure this same setting is selected in the product category in Admin>Products>Categories.
When you create a product, you can set the minimum stock level which will trigger the low stock email alert.
The quickest way to set the starting stock levels of your products is to perform a stock take.
This is also the best way to update the stock levels of many items at the same time e.g. when receiving a delivery.