Error - 'The Stored Procedure for allocating stock has failed...' when saving a sales order

If it is possible or appropriate, one thing to try is to select a different stock location when creating the order.
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To address the issue for the particular stock item or location, Support will need to check various elements. Therefore please raise a new case online and reference the title of this case and attach any supporting evidence such as a screenshot of the error and details of the selected stock item and location causing the issue.