​@KennethP For Phantom parts (Planning Method = P), as I understood your question, demand information will be created to calculate the demands. However you see no supplies created for those. This happens MRP is trying to consume the On Hand inventory for Planning Method P parts before the demand is passed to the next level.

Planning Method K on the other than transfer the demand directly to the below levels. However it is not possible to maintain On Hand quantity for Planning Method K parts. This might solve your problem, but it depends on the solution. So please check if it suites to your needs.