Smartforms + Form interface tables declaration

Hi

I know how to declares tables types and use them for global internal tables declaration in Smartforms...

But I forgot how to declare form interfaces tables when we do not have the linked data dictionary table type object for it

I have custom table ZNOTIF and I need to declare a internal table in the Form Interface tab of type ZNOTIF.. please let me know how to do it

I have tried it the same way I did it in the global data tab

TBL_ZNOTIF LIKE STANDARD TABLE OF ZNOTIF

but this does not work in case of Forma Interfaces... please let me know how to do this