Hello everyone,

I’m trying to display the components (and their lot numbers) of manufactured products directly on the Delivery Slip or Customer Invoice PDF, using Odoo Studio (v19) only — without custom modules.

The goal is straightforward:

When a finished product is delivered or invoiced, the report should show the lot numbers of the components consumed in its manufacturing order.

We’ve tried several approaches through Studio: duplicating the standard reports, adding computed fields, or using server actions to gather the data.

However, we keep running into the same issues:

• Studio refuses to save the report with errors like “Error while rendering the template” or “Entity ' ' not defined”
• Or the report saves but the component section stays empty
• Or we get RPC_ERROR exceptions, usually caused by the QWeb rendering engine limitations in Studio

In short, the XML/QWeb code works perfectly fine in a custom module, but not in Studio — it seems Studio doesn’t support nested loops such as:

t-foreach="move.production_id.move_raw_ids.mapped('move_line_ids')"

👉 Has anyone managed to display the component lots linked to a manufactured product in a Delivery Slip or Invoice purely using Odoo Studio?

Is there any known workaround or recommended approach to bypass the QWeb limitations (for example, by preparing the data in a computed field or a server action)?

Thanks in advance for your insights or shared experiences!

— Franck