Varaince settlement and costing sheet in REM and Production order

Question

for REM, repetetive manufacturing, what's the difference between REM and production order in terms of variance settlement and settlement profile design? what's the difference between process order and production order in terms of variance settlement and settlement profile design?
for actual overhead(fixed and variable), can it be calculated automatically by costing sheet? user is very angry to input actual overhead by jounal entry. also how about plan scrap, how to define it in configuration? besides order confirmation, where can I input actual scrap?

Answer 1

For variances, there is no difference between the 3 diferrent orders. The settlement profile can also be the same.  The real difference from a CO perspective concerns the calculation of WIP and the settlement rule.  Process orders and production orders normally use a full settlement rule (though periodic settlement is also possible) and WIP is calculated based on actual cost.  Repetitive orders only use periodic settlement and WIP is valued at target cost.
From an overhead perspective, there is no difference between the 3 types of orders.  Overhead sheets are assigned through the costing variant and costs are applied through period-end process. 
Plan scrap is maintained in master data, either in material master, routing (receipe for process orders), or bill of material.  Acttual scrap usually happens based on the quantity of components issued to the order during confirmation or by the amount of scrap reported during confirmation.  If you are backflushing components, as you normally would do for repetitive, then you can adjusted the consumed quantities by doing an additional goods issue to the order (movement type 261).
thanks,