Mixed-Mode attributes in standard BOL entity

Hello,

I have a requirement to add value attributes in standard bol entity. I mean mixed mode attributes so that i can use both attributes in view configuration. I tried to add value attributes through wizard but its given error after attribute added to it, Later i tried to add manually by creating getter-setter methods for that value attributes, still same errors. Can any one tell me how to use mixed mode attributes. Any answers will be appreciate.

Regards,

Nizamuddin.