Why is behaviour running when form value hasn't changed.

[Margaret Boisvert]

I have behavior that is attached to a custom field (Client Type).  If the Client Type changes, I need to reset another custom field (State) to None so that the user has to pick it again.

This works fine while making changes to different fields on the form, but the behavior also runs when I submit the Create form and wipes out the other custom field so the form throws an error because the 2nd custom field is required and has been reset to None.

The value of the Client Type field did not change but the code is still running.  I have verified the through logging.

import com.atlassian.jira.issue.CustomFieldManager
import com.atlassian.jira.issue.fields.CustomField
import com.atlassian.jira.component.ComponentAccessor
import org.apache.log4j.Level

log.debug("Running Client Type field code")

def ClientTypeField = getFieldById(getFieldChanged())
def selectedClientType = ClientTypeField.getValue().toString()
log.debug("Client Type = " + selectedClientType)

def stateField = getFieldByName("State")
stateField.setFormValue(null)

Why is the behavior running when I submit the form???