Production Cost is wrong when a batch belongs two periods and has wip completion return

 Hi all,

Now, we have one problem, my cost type = PMAC . I give you one example:

- A batch :

  + Ingredient issue: 29-nov-13

  + wip completion : 30-nov-13, quantity = 10

  + wip completion return : 30-nov-13, quantity = 10

  + wip completion : 01-dec-13 quantity = 10

  + close batch

when running actual cost process, the system yields all ingredient consumption amount for product in nov-13, and ingredient consumption amount for product = 0 in dec-13

If there' anyone else got the issue the same and having solution, please help me !!!

Thanks,

Alice