Allow non salable product for return
From https://discuss.tryton.org/t/error-in-sale-complaint-action/2317, I think we should not have constraint on returns because product may have been salable or purchasable in the past (before the return).
This instance will be upgraded to Heptapod 17.9.2 on 2025-04-24 between 17:00 and 18:00 UTC+2
From https://discuss.tryton.org/t/error-in-sale-complaint-action/2317, I think we should not have constraint on returns because product may have been salable or purchasable in the past (before the return).