Can we create a view involving a standard table and a ZTable ?

Hi,

I created a view based on 2 tables : EKKO and a Ztable having EBELN field in common.

Now, when i try to create a PO in ME21N , this view should get updated.But,It doesn't happen so.

So i want to confirm that is it not possible to create a view on a Ztable...

Also can anyone suggest any other option to do so...