returning an item to inventory

SOLVED

Hi,

How do we go about returning an item to inventory?
Scenario: We charge a deposit/security fee for the skids our product arrives on. 
On the invoice we can show 'X number skids' going out with shipment.  However, unlike Sage 50, we can't just show 'X number of skids' being returned. And deduct if from the customers next invoice or show it as a return of skids that we refund the money.

How do we go about this?

The invoicing program won't accept   ' -5 skids  as a return' it shows an error.
I have set the skids up as 'stock item' so we can track how many are out.  Is that what causes the error? Advice is appreciated.
Thanks

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