ENTERPRISE AGREEMENTS – dispute about matter arising under agreement – s.739 Fair Work Act 2009 – dispute about quantum of annual leave entitlement under cl.17 of the Royal Flying Doctor Service, Central Operations, Operations Co-ordinators Agreement 2014 which is expressed in ‘rostered working days’ – whether average ordinary working hours define entitlement – principles of interpretation of agreements considered – employer submitted employees entitled to 30 x 7.6 hour days per year – ‘rostered working day’ is a defined term and differs from the ‘working day’ used in other leave entitlement provisions of agreement – rostered working day is 12 hours under agreement – wording of clause 17 is unique – whether contrary common objective intention was agreed during negotiations – no reference to 228 hour entitlement (30 x 7.6) during negotiations – considered context of clause within agreement – ordinary and natural meaning of provisions applied – employees entitled to 30 x 12 hour days of annual leave – Commission cannot re-write agreement or determine an approach that is inconsistent with terms of the agreement. CPSU v Royal Flying Doctor Service of Australia Central Operations