Steps to reproduce the bug:
- Install mrp_plm
- Create a BoM with an analytic account
- Create an ECO
- Start the revision

Problem:
The new BoM version doesn't have the analytic account from the original
one.

opw-3329901

closes odoo/odoo#124841

Signed-off-by: William Henrotin (whe) <whe@odoo.com>