France Custom Ecotaxe - Manage on Products

This module moves the management of French ecotaxes from product templates down to individual product variants, so you can fine-tune the ecotaxe for each variant.

On the product form you get an 'Ecotaxe Classification' field, a computed 'Ecotaxe Amount' and a 'Manual Fixed Ecotaxe' field. The amount is calculated automatically: if the classification is weight-based, it multiplies the classification coefficient by the product weight; if you enter a manual fixed ecotaxe, that value is used instead; otherwise the default fixed ecotaxe of the classification is applied.

When a new product variant is created, the module keeps the classification in sync with its template: if the variant has a classification and the template does not, the template is updated; if the variant has none but the template does, the variant inherits it.

It only touches the product.product model and depends on the French ecotaxe localization module. No new menus or reports are added.