Action message is incorrect when existing the inventory journal

Dear Experts,

I got the problem with action message in our AX 2009 system as follows.

1/ All Planned Production order & BOM line & Purchase order got CANCEL action message when existing an inventory journal (transfer/counting) after refreshing MRP/MPS.

This caused incorrect information when we process to cancel the Purchase order.

2/ But when I click on button Update/Master scheduling for specific item in its Net requirement, the action message of Purchase order changes from CANCEL to ADVANCE/POSTPONE.

It turns to correct information to pull in or push out instead of CANCEL.

I don't know why this happened, and why there is the different between Batch Master scheduling & Individual Master scheduling refresh.

I setup the Coverage group as follows

1/ For FG & Semi FG: Period 1 day, Time fence = 400days, Positive = Negative = 400days, Explosion time fence = 400days, Action time fence = 400days.

2/ For Item: Period 30 days, Time fence = 400days, Positive = Negative = 400days, Explosion time fence = 400days, Action time fence = 400days.

Pls help me to understand about this and how I can fix it.

Thanks so much,

Vu

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