The PO is shown as not submitted in the workflow status bar, but the button on the tool is a Recall button rather than a Submit one showing that the document has been submitted:
In addition, if you tried to open the Workflow History window, the following error was produced:
I did some exploring and found the issue was corruption on the Purchase Order Work (POP10100) table whereby the Workflow_Status column had the wrong value; it was set to 4 instead of 6. There was a set of about a dozen POs with this problem; ones before and after were working correctly so it appears to have been a temporary issue which then can't be reproduced.
To fix the corrupt items, I created a simple SQL script which would correct the Workflow_Status column:
Created by Ian Grieve of azurecurve|Ramblings of a Dynamics GP Consultant (http://www.azurecurve.co.uk) This code is licensed under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International (CC BY-NC-SA 4.0 Int). */ UPDATE ['Purchase Order Work'] SET Workflow_Status = ['Workflow Instance Master'].Workflow_Status FROM POP10100 AS ['Purchase Order Work'] INNER JOIN WFI10002 AS ['Workflow Instance Master'] ON ['Workflow Instance Master'].WfBusObjKey = ['Purchase Order Work'].PONUMBER WHERE ['Purchase Order Work'].Workflow_Status = 4 AND ['Workflow Instance Master'].Workflow_Status = 6
As always with SQL scripts which do updates, make sure you test the script and have a good backup