If you have rejected a Purchase Invoice Register transaction before un-matching the purchase order, the PIR may need Support to unlock (un-match) the transaction.
To try and un-match the invoice, Follow the steps here:
Log in to Dimensions.
Click on Creditors.
Under the Invoice Register section, click Match.
Select Match Orders.
In the selection form, enter the details of the order and enable the flag labelled "Include Matched Invoices".
Double click on the order to open it.
Deselect the matched lines.
Click the green tick to save the changes.
Click on Creditors.
Under the Invoice Register section, Click on Amend Entry.
Locate the invoice in the list.
Double click on the invoice to open it.
Click the Save icon to update it.
Match the invoice to the order again which should then resubmit it for approval.
If this is unsuccessful, please raise a new case online and reference the title of this article.