Adding field to an Existing form

Hello All,

I want to add Product Name field in InventTransItem form. I have added EcoResProductTranslation in data source of that form and added the Product Name field in Grid of the form.

The problem is that my form is displaying data but its random data. I want to manipulate data on the basis of Item Number (the data should be fetched according to Item Number column). As shown in the screenshot.

I know about display method but I dont know how to use it as I am new to X++.

Can anyone help me in this regard.

Any help would be appreciated.

Thanks.