Customization of standard web dynpro

Hi,

     I am trying to copy the standard web dynpro component 'ERC_C_REQ_MGMT' into Z component.

There are some standard enhancements in ERC_C_REQ_MGMT which is not getting copied, because of which some dropdowns are not working.

I tried to copy the enhancement from SE19 but its not allowing. So how can we do that ??

Regards,

Abhishek.