The required_attributes setting
specifies whether users are required to complete certain fields before
designating a task as complete. If one of the required task fields
is missing or contains an invalid value, the task does not transition
to the completed state and an error message is reported.
The text attribute consists of names of attributes, one
on each line without leading or trailing spaces. The pseudo-attribute
"change_request" might be specified to require that
the task must be associated with a change request.
Type: Type definition attribute (task, text)
Default
value: not set