4POS has the ability to allow you to "save" a sale. This is used when you have rung up products & the customer then forgot something or wishes to add something to the cart. The sale can then be saved & you can continue with the next customer. If you forget to recall this sale - it will be left "Waiting" & you need to finalise the sale - or even void it - before you can do a cashup. To recall the list of Saved sales - press Shift-V to show the list of open transactions.
Once you have the list - Use the arrows to go down to the transaction you require (If there is more than 1) & press enter. Now - either cash-off (Finalise) the transaction or void the sale or even save again - if the customer has left without payment. Managers - beware that these voids will show up on the dayend & you will be held responsible!