How to restrict Repair actual lines for Materials in Depot repair

Hi,

we are entering the manual charges or adding the source from Repair estimate to Repair actual tab for booking materials (for invoicing) in Depot Repair,  the material are booking without any issues even the item(material) not available in our inventory . But we cannot give the material in debrief if the item qty not available because there is assigned sub inventory. So how can we assign sub inventory /restrict when booking the material in repair actual tab.

Regards,

Afzal Ahmed