Show the mechanism of the following reaction. 
Definitions:
Planning Bills
A material grouping created in order to assign an artificial parent to a bill of material; also called “pseudo” bills, kitted material, or kits.
Modular Bills
A breakdown of components and assemblies needed to produce an item, organized in a hierarchical structure that supports efficient changes and updates.
Phantom Bills
An imaginary bill of materials used in manufacturing to simplify complex assemblies and compositions without altering inventory levels.
Master Production Schedule
A detailed plan that outlines what is to be produced, how much, and when, guiding manufacturing operations.
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