Reload a new BoM in a manufacturing order - odoo

Question

In odoo V13, we need to "update" the BoM in a manufacturing order. We use the PLM application to make changes to BoMs, and a change was made after the manufacturing order was created. We would prefer to not delete and re-create the manufacturing order.
I came across this post but there are no instructions for Odoo V13. I tried to figure it out by trial and error but I don't know odoo enough to be certain the result is correct.
This is the code for V14 with functions unavailable in V13 identified:
for record in records:
record._compute_allowed_product_ids() <- Not in V13
record._onchange_bom_id()
record._onchange_move_raw()
record._onchange_move_finished() <- Not in V13
record._onchange_location
I planned on adapting it to work with a wizard to allow selecting a specific BoM version.
How can I create a server action to "update/change" the BoM of a manufacturing order?

Answer 1

I haven't tested it fully but played around with it on an odoo 13 runbot instance.
# only change draft manufacturing orders
for record in records.filtered(lambda r: r.state == 'draft'):
# trigger changing to the same product
record.onchange_product_id()
# trigger bom change from product onchange
record._onchange_bom_id()
# trigger raw materials moves change after bom change
record._onchange_move_raw()
# trigger some other changes which usually are done anyways
record.onchange_picking_type()
record._onchange_date_planned_start()
record._onchange_location()
# finally set procurement group again, which is usually done in create()
record.move_raw_ids.write({
'group_id': record.procurement_group_id.id,
'reference': record.name,
})
It will be much more difficult to change BoMs on confirmed manufacturing orders, so this solution only works for draft orders.