Product Variant Name on InvenOnHandItem Form

Hi,

we have a requirement where users want to display, sort and filter Product Variant Name on Inventory On Hand Listing. 

Our progress so far:

1. we were able to get the variant name using joinchild() approach in a display method, but this is not enough since we need to sort and filter the field.

2. We're aware of the ItemId grouping on in the “modifyQuery” method on the “InventDimCtrl_Frm_OnHand” class. Because of this we cannot get the InventDimId to join with InventDimCombination, DistinctProductVariant, and so on to get the variant name. 

3. We tried to extend the “modifyQuery” method and added group by InventDimId. However, since the products have variations, the records in the form will duplicate. 

4. We even duplicated the standard InventOnHandItem form and overlayered the codes, but nothing works all because of missing InventDimId.

Does anybody know any other approach to do this?

Thank You.