DEFINITION OF TEMPORARY POSITION. A "temporary position" means a position of twelve (12) months duration or less. A temporary position includes but is not limited to, temporary assignments to cover pregnancy and/or parental leaves or LTD. Any extension of a temporary position must be mutually agreed upon in writing between the Employer and the Union. Such agreement shall not be unreasonably withheld. If a temporary employee is unable to complete his/her temporary assignment for any reason the employee will be deemed to have resigned.