The important part is to remember that 4POS was developed for all parts of deposits.
In other words, a product in 4POS will consist of the content (liquid) & the container (deposit).
So, every product that has a deposit will be linked to the deposit of the item.
Eg if you had to look at a 1 Litre Coca Cola, the deposit will be something like Cold drink 1L - 12 bottles in the crate. The price of the container will be eg, 80c (Glass) & the crate in which the bottles come may be R9.00
So the cost price of the item will be calculated for the glass & the liquid in the glass. The case (Shrink of 12) will be for the crate, the 12 glass containers & the liquid of these 12 items.
The selling price will therefore be for the total of these.
You will furthermore link this deposit to the supplier under suppliers / creditors.
Now, when you do a GRV,
You will then purchase the liquid part & then the deposit (glass & crate - full).
Once the deposit is linked to this supplier, 2 additional screens will come up than normal - a screen for deposits purchased & also for deposits returned to the supplier!
This makes up a perfect invoice!