Hi Pilvi,
Yes indeed its quite a long post with so many questions :-). I will try to add some of my inputs -
- While using product structure in IPPE for example, you would need master data for materials and you will arrange your structure accordingly within it - like access node, view node structure node, component variant etc. Similarly for process structure. Yes its possible to link PV with IPPE structure. You can see it via PPE ->Envirnment -> Production Version
- Yes ideally should be created in ECC and once you CIF it will be present in APO too and can be accessed via /SAPAPO/PPE transaction. Systemically though you should be able to create IPPE Nodes directly in APO too but not the recommended approach like other master data.
- Model mix planning can be used to run FG products also - provided you have corresponding VC and restrictions maintained inside it. You need to understand if you are able to exploit the benefits provided by MMP - You can find greater details in SAP Consulting Note on MPP - 627377
- Takt times is dependent on takt based scheduling and the critical line which your product will follow on the assembly line. You would need a Line Balance assignment in your Line structure and you will have option inside it to maintain Takt for each of the stations
- I think Dummy Product Structure/process structure can be made in APO - you though need to test out the same. For example, view node is just logical grouping and is just a dummy node only.
Hope it helps.
Regards,
Alok