A simple solution to this question could be the creation of the following server action (image from Odoo version 18):

hope it helps!

code:

for product in records:
    bom = product.bom_ids and product.bom_ids[0] or False
    if not bom:
        continue
    bom_lines = bom.bom_line_ids
    if not bom_lines:
        continue
    total_weight = 0.0
    for line in bom_lines:
        component = line.product_id
        quantity = line.product_qty  # Quantity in units
        component_weight = component.weight or 0.0  # Weight in kg
        weight_contribution = component_weight * quantity
        total_weight += weight_contribution
    product.write({'weight': total_weight})
    

Hi,

You can check this community module : https://www.odoo.com/apps/modules/10.0/product_weight/

This will help you to get the weight of a product as the sum of its component products. Have a look at the module.

Then regarding the weight in delivery slip you can inherit the report template and access the weight of the product from the product master and add to it.

Thanks

I have slightly improved the code by inserting UOM conversion

for product in records:

    bom = product.bom_ids and product.bom_ids[0] or False

    if not bom:

        continue

    bom_lines = bom.bom_line_ids

    if not bom_lines:

        continue

    total_weight = 0.0

    for line in bom_lines:

        component = line.product_id

        component_uom=component.uom_id.relative_factor

        quantity = line.product_qty  # Quantity in units

        line_uom = line.product_uom_id.relative_factor

        component_weight = component.weight or 0.0  # Weight in kg

        weight_contribution = line_uom/component_uom * component_weight * quantity

        total_weight += weight_contribution

    product.write({'weight': total_weight})

Thanks for the reply, but I still have not found a solution for Odoo 11