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Return Solution Version in an Expression Box

Folks,

Don't claim to understand this 100%, but I do know it works.   Put this formula inside a formula dialog box for an expression box on your form, and when you invoke it it'll show you the current solution version - without having to write code!

substring-before(substring-after(/processing-instruction(), 'solutionVersion="'), '"')

Thanks,

Tim

 Edited on 10/7 per input from Karsten, thanks!