Analytic reporting can now group entries by product category, making it easier to understand where costs or revenues are coming from. This gives finance and operations teams a clearer way to compare performance across product groups without extra manual filtering.

Add the related (non-stored) 'product_category' field on the account.analytic.line model to make it available in the Analytic Reporting "Group By"

task-6219418

Forward-Port-Of: odoo/odoo#266378