Error: 'Element is a changed element that should have appeared on a purchase order in the past'

This error can occur when you are trying to do a task on a purchase workstep.
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It is caused by finance elements missing purchase order records in the tables that they should have. This does not affect Payment or Billing or usual day to day usage of Mosaic Finance functionality, but for the finance elements where that are in this state it can cause you to be unable to do further with that element or to complete a step with that element present within it.
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We have a safe and simple fix that looks for all records in the database missing a purchase order record and makes the required inserts so that going forward you should have no further issue.
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As this is likely caused at the time of migration of initial data into our systems there can be large numbers of elements in this state going into the thousands, but the fix resolves these all. We will provide you a full list of these records, the persons they affect, and they are backed up also. We will ask you to do a few spot checks in test of identified affected persons before running the script in Production for you.
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For 21.2+ users, if you have picked this error up in your Error Logs area of the system (Configuration Tools), then please raise a new case online and reference the title of this article.