Hi Hiranya,
Are you using Zbol entity in your view. if you want to use zbol entity that is not existed in your SO model because SO is a standard model.. have you extend the standard model.
if you want to extend the standard model to add your zbol entity just go through this link..
Extend BOL Model BT with custom table type relationship - CRM - SCN Wiki
Extending the standard BT Model
Extending BOL model BT with table relations
other wise you can create your own custom model as per your business requirement.
just go through this links..
Creating a Custom Genil/Bol object Model
Implementation of a Custom Genil Model to Create Component in Web UI
Thanks & Regards,
Srinivas.