# When item-level source verification takes effect

The critical property for an item takes effect in the InForm application only when the form that the item is on will not otherwise be verified, due to the Partial SV settings for subjects and forms.

By default, all subjects are verified. However, if you use the InForm user interface to limit the set of subjects and forms to be verified, all subject and forms no longer need to be verified.

- If a subject or form is selected to be verified, every SV Required item for those subjects and forms must be verified.
- On all other forms that are not selected to be verified, only the items that are designated as critical (not all the SV Required items) must be verified.

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