Insert New PartWhse Record

We are looking to add a warehouse to a part if a user specifies to do so through the Move Inventory Handheld form. I’ve created a Pre-Processing directive on InvTransfer.CommitTransfer and I am struggling to get the warehouse to insert correctly using the Part BO.

I have tried multiple iterations of Invoke BO and Fill Table by Query against Part.GetNewPartWhse and Part.UpdateExt. What is the correct way to get this BPM to insert the new PartWhse record?