Hi
This is a standard behavior of MTO- sale order settlement.
You can find the EK02 condition will update in sale order after saving
And the cost incurrent during the production such as GI value + activity value will be transferred to sale order while doing CO88/Ko88 for that order -
You can find the settlement rule for the MTO production order is SD1.
In OVZG for the respective requirement class ( for the strategy maintained in Material master, If you use strategy 20 check for requirement class 40 in OVZG), you can find the settlement profile as SD1.
Refer http://scn.sap.com/thread/1042935
Regards
JH