Changing Kit times on MFG parts is not being taken into account by MRP

Kit times - kit time from 2 days to 7days (time to assembly components prior to issuing job to shop floor.)

Part Maint > Plant > Planning > Kit time

MRP has run overnight but newly created firm jobs it has created still have the old 2 day time

It seems to work for purchased parts but where the component is a manufactured part it does not seem to have extended the kitting time.