Can you please help me understand a bit more on what you refer as "normal" error mesage?
What we have is a process that creates a link between the CR and Configuration Item on creation. This is what seems to be causing all the extra stuff in the error message when it would be better just to show the plain validation rule error message.
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The error seem to be due to process builder which is failing. So you will have to add exception on Process builder or set the value in validation rule.
If you deactivate this process it will show normal message.
As the process builder process CI manager approval V3 is conflicting with your validation rule criteria you get this error.