Hi Boss,
It can be specified in MRP4 view of material master Selection method - Selection only by PV.
If it is specified in the material master of the material to be produced that the bill of material is to be selected using a production version and if a routing is also assigned in the production version then this task list is copied to the order.
If there are several production versions, either the system decides automatically which production version is used, or you choose the production version manually. You make the settings for this in the order type-dependent parameters OPL8.
Please refer SAP help link,
http://help.sap.com/saphelp_470/helpdata/en/e8/eb83f9715a11d1b5900000e8359890/content.htm
Regards,
R.Brahmankar