Validation rule to use
Use the sentence Invalid when [...] to set a field to be triggered when a limit is reached.
Validation rules available
Invalid when empty
Allows to set a field as invalid when it is empty / not empty.
Alternative rules:
Invalid when not empty
Invalid when checked
Allows to set a checkbox field as invalid if it is checked.
Alternative rules:
Invalid when unchecked
Invalid when U
Allows to set an option button field as invalid if an option is selected.
Alternative rules:
Invalid when S
Invalid when C
Invalid when NC
Invalid when Yes
Invalid when No
Invalid when NA
Invalid when Combolist_item
Allows to set a drop-down list field as invalid if an item from a combo or multi list is selected.
NB: This does not work and apply to external lists. (list with Updated by rule)
Alternative rules:
Invalid when not Combolist_item
Invalid when Text
Allows to set a text field as invalid if a string is typed in the field.
Alternative rules:
Invalid when not Text
Invalid when Value
Allows to set a numeric field as invalid when a value is typed in the field.
Alternative rules:
Invalid when not Value