Display ItemId field in InventOnhandItem form's grid in Overview tab

Hi,

I want to display ItemId in the grid of InventOnhandItem form's Overview tab by default.

I can see that ItemId field is already available in the Design of this grid but it is not being displayed.

I even checked the Visible property of this field and it is set to Yes.

Even checked in init and updateDesign methods of this form.

But this field is not being disabled anywhere in these methods.

I am confused how to make it visible in grid.

Please suggest.

Thanks in advance.