My formula as seen in the screenshot is not working.

Essentially I'm trying to accomplish "If the length of characters input into this field is greater than 255"

enter image description here

1 Answer 1


The validate input is actually the opposite of a typical validation rule. In this screen, your formula is about denoting whether the input is valid (true) or not (false).

NOTE The formula expression must return a Boolean value (true or false).

If the formula expression evaluates to true, the input is valid.

If the formula expression evaluates to false, the error message is displayed to the user.

You should look to be doing the inverse of what you're doing in the formula

LEN({!Project_Description}) <= 255

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