Scenario
When the Advanced Bill of Materials feature is enabled and an Assembly Item has another Assembly added as its Components (Item Source is set to Phantom), the Components of the Phantom Assembly may appear even if the Bill of Materials Revision is set to Inactive
Solution
The Bill of Materials Revision of a Phantom Assembly needs to have an Effective End Date in order for the Components listed in the same to no longer appear on newly created Work Orders.
This behavior can also impact the Generation of Supply Plan because you will see on the Work Order that the Components of the Phantom Assembly appears twice as if it is setup to be that way in its Bill of Materials Revision