RFC: production_split
Similar to stock_split, a module production_split has its own purpose when the production is planned from the requests.
The idea is similar to [1] but I don't think we need to take care of splitting in waiting and assigned state. It is much more complex but it is still possible to go back to draft in such state. Also normally the production is sent to waiting once the planing is done.
[1] https://bitbucket.org/nantic/trytond-production_split