[ ASCP ] Cannot view supply pegging for Planned Order

Hi,
I'm newbie here, I'm currently using OPM ASCP (12.0.6).

I have a 2 level formula currently like this
10 Item A (Make-MRP/MPP Planned) --> 10 Item B (Buy-MRP/MPP Planned)
                                                            10 Item C (Make-MRP/MPP Planned) --> 15 Item D (Buy-MRP/MPP Planned)
                                                                                                                         15 Item E (Buy-MRP/MPP Planned)
All the item are End Assembly/Soft Pegging
Already Create Validity Rule for Planning, register Plant Resources, and entry Forecast for Item A

When running planning from workbench, the planned order was created for Item A, but the problem is:
1. I can see demand pegging for Item A, but I cannot see supply pegging for Item A