How to restrict 'Parent lot number' field to display only parent lots.

Hi,

We are using Oracle Inventory R12.1 to maintain medicament's. We have enabled the lot (Control - Full Control) and lot expiration (Control - User Defined) for all inventory items.

We want to keep medicament's in the system with their generic name (i.e Clopidogrel 75 mg), but this medicament can came from different manufacturer, and the commercial name of the medicament changes, so we thought to create a different lot for each commercial name.) i.e Item Clopidogrel 75 mg Parent Lot Diloxol Item Clopidogrel 75 mg Parent Lot Grepid ). Also, we have enabled parent + lot control, and we have created each lot for the item 'Clopidogrel 75 mg'.