Reference field unknown in smart form
In smart form I have defined one internal table under form interfaces table option and that is populating in driver program. I have defined by referring the structure like it_itab like zab(structure). In driver program also I have defined the internal table by referring the same structure like
Data: begin of it_itab occurs 0.
Include structure zab.
Data: end of it_itab.
The structure zab contains following fields.
And in smartform I used drag and drop operation for printing all these internal table fields data.
But while running the transaction it is giving the error message as
Reference field IT_ITEM1-NTGEW unknown in form.
Please help me where I did mistake. I will give points.
Thanks a lot in advance.