[FIX] Credit notes must start with an R + journal code

Trello card: https://trello.com/c/IwiabyBh/308-factures-rectificatives-cs-no-afegeix-el-prefix-r

More context can be found here: https://github.com/OCA/cooperative/issues/97

requested review from @DaniilDigtyar

assigned to @enricostn

Why the simplest looking changes are always the rabbit holes ones...

I have read it all that you shared, and this MR make sense, and we should backport it to 14.0 in cooperator

Also, maybe we can use this module (account_move_name_sequence) if we think the ir.sequence use instead of the sequence.mixin is better and needed, specially if every company will have his own sequence.

approved this merge request

added 9 commits

• a3240179...7ab20826 - 8 commits from branch dev
• dc5983f1 - [FIX] Credit notes must start with an R + journal code

Compare with previous version

mentioned in commit 3d8d477d

merged

mentioned in merge request !230 (merged)