Dear Rick,
Try to create one query in SQVI by joining MAPL, PLKO and PLPO tables and provide a Z t-code for it using SE93 so that other users can have access. In this, you can enter multiple header materials for which you want to get the routing details.
The list of the headers can be found in CS12 output with assembly indicator filter ( and if you are using Phantom assemblies, remove them).
Glad if I could help you.
Thanks and Regards,
Rajen