To return an old unit to a supplier you do the following:
Go into Parts > Return Old Units > Old Unit Stock List.
Check the part to be returned is sat in the 'Old units stock list'- example shown below.
On the Return Old Units main window select the 'Return Old Units' option. The below window will appear:
Enter the following details:
Quantity to Return
Select Add and the details will appear in the Returns Note Details box.
Once all parts have been selected for return select the Complete option.