'String or Binary data would be truncated'

This Truncation error will prevent you from hitting the post button.
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What it's saying is:
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There are fields populated, either within the posting or within the matter (i.e. matter Details) in which the posting is being assigned that are too long.
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When you see this message pop, try and shorten (abbreviate if possible) the content of some of the fields populated within the posting screen.
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If you are still unable to resolve this yourself, please raise a new case online and reference the title of this article.