Our scenario:

Our base product is gas and hence always stored in cylinder (gas can’t be stored standalone). Cylinders are RTPs sent to customer and customer returns them back. The RTPs are serial number tracked (“C” –Serial Number Requirement in inventory Management – tracking till bin level in EWM). We need to do putaway, pick, PI, adjustment, internal transfer etc for both of them together (not separately) as they are one physical entity from the handling perspective.

The below methods have already been checked and not working for us

• Pack base product in RTP as main packaging material (cylinder), create HU and store HU in warehouse. But main packaging material can’t be serial number managed/tracked.
• Pack both base product and RTP as auxiliary packaging material, create HU and store HU in warehouse. Although auxiliary pack material as content in HU can be serial number managed, standard transactions (/SCWM/PRDI & /SCWM/PACK) do not allow entering serial numbers against the auxiliary packaging material in HU. Moreover why to create another license plate as HU as we have already the serial number as license plate.
• Pack both base material and RTP as normal products in HU, create HU and store HU in warehouse. Serial numbers can be entered for RTP. But why to create another license plate for HU as we already have a license plate for serial number. We can’t even use the serial number as external HU number because serial number is unique at product level whereas HU is unique at warehouse level.
• Store both the base material and RTP separately in bin (no HU). But why to putaway, pick and PI etc them separately. There are chances or errors/mistakes.

What is best and efficient method in EWM to handle the RTP and base product together from storage and handling perspective? What is the SAP standard suggests for the scenario? If not any existing, is there is any roadmap from SAP for this in future?

Any suggestion, recommendation, SAP best practices or SAP road map in this process will be highly appreciated.