Hi bkvs sk,
I think you have made some simple mistakes, just refer to these links it may be helpful,
https://docs.google.com/document/d/1aeAm2dUWpUIHMp0xWRqKamUntBFMe8q_IhEmPCgAizc/edit?hl=en_US
http://howtosapcrm.blogspot.in/2012/07/create-custom-bol-from-ztable-for-bp.html
http://harelgilor.blogspot.in/2010/06/sap-crm-how-to-create-your-own-bol.html
Regards