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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Please raise a new case online and reference the title of this article.
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Please include any relevant references for the records affected.