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Back order is where they are ordering it from another store and are waiting for it to come in.
A back order is an order which cannot be currently filed or shipped, but is requested for when the item becomes available.
how do I get my money back if I fill out a money order wrong
Can you get your money back on a money order if you have already filled
Typically, back (retroactive) child support is included (or not) in the original order for ongoing (current) support.