Delta Plugin - One of the lines on Receipt from the warehouse has lost its link to the purchase order

Check if the line on the receipt should be on the order. The line with the issue will have *** instead of a number in the first column, showing it is broken.
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If this line of stock doesn't match the order, then see if it matches a different order by using the Match to different order toolbar button as prompted
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If there are no other orders to match this to, then we'll need to remove this for you.
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To resolve this - our support team will need to investigate, run scripts or liaise with the hosting or development teams. Any Issues with contacting us, please see the following Get support in Dimensions.