Add already depreciated value
From https://discuss.tryton.org/t/asset-importing/1706
When migrating existing assets to a new Tryton system, we need to be able to encode the currently depreciated value to avoid to recreate all past moves.
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/asset-importing/1706
When migrating existing assets to a new Tryton system, we need to be able to encode the currently depreciated value to avoid to recreate all past moves.