Origin group usage clarification - Overhead calculation

Hi Experts,

Please advise on the below issue -

Client currently uses a basic costing sheet which has base as secondary cost element (43), Overhead rate % (D000) and the Credits post to a Cost center (XXXX)

The requirement is they would like to split the cost in the future to 2 cost centers instead (XXXX & YYYY),  keeping the base and overhead rate the same. They would like to see the split based on the profit center maintained on the Material master

Please note - Currently, we do not use origin group / Overhead key / Overhead group functionality

I was thinking maintaining origin groups will help resolve this issue, so I tested by assigning Origin groups (OR1 & OR2) on the Finished goods Materials and assigned these origin groups in the Credit rows (Additional row of Credit for 2nd Origin group)

Now, Costing sheet looks like below -

Row     Base     OH rate     Desc     From     To     Credit

10        ZLR                        Base                                       

20                    ZOH1         Overhd     10               Z01 ( Has CE1 + OR1 + Cost center XXXX)

30                    ZOH1         Overhd     10               Z02 ( Has CE1 + OR2 + Cost center YYYY)

When I ran the Overhead calculation using above for a single material, system posts double entries, meaning if $100 overhead is to be posted - system posts 100 to Cost center XXXX and another 100 to Cost center YYYY!

Appreciate your inputs on this issue

Thanks