Steps to reproduce the bug: - Install manufacturing app - Create a product “A” - Create a Bill of Materials for product A > add any product > save - Create another Product “B” > Create a BOM and add the product “A” in quantity “0” > save - Click on “BOM Structure & Cost” for product “B” > open the sublevel BOM dropdown of the product “A” Problem: An error is triggered because the quantity of the product is "None" opw-2585033 closes odoo/odoo#73323 X-original-commit: 06c172746f2d2dc8235c6e607342506bf9ef1551 Signed-off-by: Anh Thao PHAM <kitan191@users.noreply.github.com> Signed-off-by: Djamel Touati <DjamelTouati@users.noreply.github.com>