I would like a message to pop up on my spreadsheet if an entry is either blank or greater than 20. Currently an error message will pop up but it will allow the user to navigate to the next cell without correcting the information. If the user inputs "25", I would like the message to pop up and then the original cell to be selected in order for the user to be forced to put a value between 1 and 20.
My current code:
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