When editing inventory in the CatalogUI, all information about inventory lost

Description

Steps to reproduce:
1. Create a purchase order with line item CodeA -> has change in the inventory record.
2. Go to CatalogUI > Edit Inventory view.
3. Try to change the quantity (purchase, backorder or preorder).

Expected: Information about order's requested quantity is available.
Actual: Information about the order's requested quantity is gone.