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 1.3.3 (GitLab 16.9.6) on 2023-04-25 at 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).