Hi,
Instead of modifying the standard Access sequence , you can create New Access sequence for service but you need to add field SRVPOS for Activity Number in the following path:
SPRO --> MM --> Purchasing -- > Conditions --> Define Price Determination Process --> Extend Field Catalog for Condition Tables
Now create a new condition table as 977 with Service master or Activity number and then create New Access sequence as ZSER assign table 977and save. You can create your new service condition type as ZSER and assign New Access sequence ZSER to it.
For to have service condition pricing in service order/purchase order, you can use routine 11 in Requirement column for service condition type ZSER in Requirement column in MM calculation schema/MM Pricing Procedure. Different pricing for service and production
You should decide which condition price you want in service PO---- price from condition record or from service contract.
Regards,
Biju K