Calculating Overhead in Process Order

Question

Hi Gurus,
We're confirming process orders on a daily basis and we're seeing very odd results in the calcuation. 
- First, the process orders are being created for the same product, so we're using the same material master each time. 
- Second, we're using the same resource for making the product. 
- Third, on the confirmation, we're entering the same times for cleaning, setup, duration. 
However, if we confirm four orders, we will see the overhead costs calculated on two or three of the four.  One the other one or two, the overhead wont be calculated. 
Bottom line, sometimes we get the cost, sometimes we don't.  The formula for the costing is in the resource, and we're using the same resource for all the process orders; so we know the formula works. 
Any ideas on what we can look for? 
Thanks,
Xamaica

Answer 1

HI All,
Kanapon - I'm using the same product for all four orders.  As you suggested, I checked the orders and the activity types are being copied to the right places.
Sundaresan - we don't have a CO consultant, unfortunately it's just us.
kent9999 - I've been checking the orders with the CORT transactions; as far as I can see, there are no differences with the orders.  Also, I checked and there are no goods movement reversals in the order without the overhead costs.
Thank you all for your help.  Any thing else I can try or look at?
Xamaica