MRP BOM Structure XLSX Level 1

This module gives users a new way to download a Bill of Materials as an Excel file, limited to the first level of components.

Where it appears: - On the Bill of Materials screen (mrp.bom), in the print/export menu, a new entry called "Export BoM Structure (Level 1) to Excel" is added.

What it does: - When run on a selected Bill of Materials, it produces an .XLSX file listing the components of that BoM only. If a component itself has its own Bill of Materials, that sub-level is not expanded, so the report stays at one level. - For each component line the file shows: an indentation marker, the product's internal reference, the product name, the quantity converted to the product's own unit of measure, that unit of measure, and the code of the Bill of Materials the line belongs to.

Business rules and behaviour: - Quantities are automatically converted from the line's unit of measure to the product's default unit, so the numbers in the file are consistent with the product settings. - Empty values (missing reference, missing BoM code) are left blank rather than causing errors.

It relies on the base BoM structure Excel module and only changes how deep the component list goes. It does not add new menus, screens, scheduled jobs or emails.