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1. In the filter list, select the filter that best matches the item you want to unallocate. This will be "All open items", "All customer open items" or "All supplier open items".
2. Locate the item you want to unallocate. This can be made easier by sorting the view by Card. If you know the card ID, you can enter it in the Card field to find all open items for that card.

3. Click the item in the list, then click Unallocate. A window will appear containing the date of the allocation and asking you to confirm your action:

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4. Click OK to reverse the allocation.

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