Setter and getter method CRM 7.0

I am trying to enhance following

Component BP_ADDR 

View BP_ADDR/ACCOUNTAddressEF

Context node: BUILADDRESS

But I am unable to generate Setter and Getter method for BUILADDRESS context node attributes.

While trying to Generate Setter and getter method I am getting some issue.

Instead of Setter and getter method automatically created one derived class.

Derived class automatically generated and message showing ZL_BP_ADDR ACCOUNT ADDRESSCN00 already Exits.

please help me to resolve this issue.

Thanks,

Ram