A developer has the following requirements:
– Calculate the total amount on an Order.
– Calculate the line amount for each Line Item based on quantity selected and price.
– Move Line Items to a different Order if a Line Item is not in stock.
Which relationship implementation supports these requirements?
A. Order has a Lookup field to Line Item and there can be many Line Items per Order.
B. Line Item has a Lookup field to Order and there can be many Line Items per Order.
C. Order has a Master-Detail field to Line Item and there can be many Line Items per Order.
D. Line Item has a Master-Detail field to Order and the Master can be re-parented.
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Why D?
Order has to be parent, so A & C are eliminated. B is tempting, but an Order wouldn’t conceptually exist without at least 1 line item, so it should be a master-detail, and the last requirement of “Move Line Items to a different Order if a Line Item is not in stock” hints that it must allow for re-parenting. Answer has to be D.