'Odoo 11.0 Inventory module customization problem?

I have added a 'back to draft' option on a customized stock_picking. When back in draft state, if any move is modified and save is called then picking successfully moves to 'ready' state. Issue occurs if a combined move is edited, in this case the save method is not called.

I am looking for a way to override 'Save' so whenever picking is edited in 'draft' state it moves to 'ready' state.



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