Validation rule to use
Use the sentence SET [...] to set a field to a specified value.
Multiple SET can be used in the same validation rule.
Validation rules available
SET U when Field is Value
Allows to set an option button field to a specific value according to a targeted value entered in a specified field.
Alternative rules:
SET S when Field is Value
SET NC when Field is Value
SET C when Field is Value
SET Yes when Field is Value
SET No when Field is Value
SET NA when Field is Value
Example: SET U when Temperature is greater than 4
NB: "NA" applies for numeric, option buttons, date and time fields/columns, whereas "N/A" applies for text and drop-down list fields/columns.
You may always use "NA" to avoid confusion, but visually on the form it will look different.
i.e.: Option buttons display "NA" and a numeric field will display "N/A", but needs to be set using "NA". A text field will display the value you set them to, which will not matter aside from the fact it might look different than the other fields/columns if you use "N/A" vs. "NA".
A photo and/or signature field/column cannot be set to N/A.
Keywords available with this validation rule
SET Now
SET Now when Field is not empty
Allows to set a date, time or date/time value automatically if a specified field is not empty.
You may use the keyword Today or Now.
You can target a column instead of a field as well.
Alternative rules:
SET Now when Field is Value
SET Now when Field is not Value
SET Now when Field is Field
SET Now when Field is not Field
SET Now when Field is lesser than Value
SET Now when Field is < Value
SET Now when Field is greater than Value
SET Now when Field is > Value
SET Now when Field is lesser than Field
SET Now when Field is < Field
SET Now when Field is greater than Field
SET Now when Field is > Field
SET Now when Field is between Value and Value
SET Now when Field is not between Value and Value
SET Now when Field is between Field and Field
SET Now when Field is not between Field and Field
SET Now when Field is between Value and Field
SET Now when Field is not between Value and Field
SET Now when Field is between Field and Value
SET Now when Field is not between Field and Value