Hello. @qdp @invitu We made a lot of improvement "in a modular way" on our development branch for mrp[1] : We are trying all changes on it in a producton enviroment with REAL DATA, and we invite to you to try our changes and merge (if you think it is possible) to addons for v6: Changes: relevant module: mrp_stock_cost -- Propose "production cost". -- Propose "returned correctly cost" And a lot more, are ver very separated every module to be understood. Please check related blueprints to understand better: I hope it can help almost evereybody. When we finish this development we will post to addons-extra and we will port to V6 if qdp can no make changes. Cases used1: -- make a Sale Order. -- validate picking. change "manually" cost on product- -- return picking result: cost is the original one. Case used2: -- Make a bill of material. -- Make a production order. -- Validate the pproduction order: -- Asign a picking to resulting product go to Incoming picking, select the last asigned, and receive it. result: cost proposed is sum(move_in)/quantity_in_line. We are improving a lot more cost management. BTW, especifically this bug is solved, i really appreciate yor feedback. [1] lp:~openerp-venezuela/+junk/mrp_advanced 2011/1/11 invitu