Reversing an allocation reverses all open items that make up that allocation. This means that, for each open item in the allocation, the open item value is reset to its original value.

In the navigation panel, double-click Relationships then click Allocations.
Locate the allocation from the list on the left hand side.
Select the allocation in the list, then click Reverse.
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The payment will now be outstanding, and the related invoices and credits will now have a non-zero balance.
A allocation number is created and added to the allocation list for the reversal.

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