Protect functionality in Smartform

Hi,

Do we have any command like Protect in smartform to keep the contents of a page together.

Also i have decalred an internal tabe in which some fields are coming from VBAK and other from VBAP, now when i am trying to declare it in Smartform interface i am getting an syntax error "table not defined in dictinory".

Thanks in advance.

Gurjeet