NoWaste does not accept order lines with a price of zero or less. Choose what to do with those lines.
Options
Allow the items with zero or negative price to be sent to Nowaste.
Remove (skip) the items
Replace with default minimal price – the price in Default 0/Negative Order Line Price is used.
Good to know
The default is Allow the items with zero or negative price to be sent to Nowaste.
For example, free gifts or fully discounted items often have a zero price.