It sounds to me as though different parts of the rules might conflict with each other.
To go off on another tangent, here's a comparative exmple from the Laws of Cricket -
However, they stuck the words 'wherever appropriate' in there, so that means you don't have to.
To go off on another tangent, here's a comparative exmple from the Laws of Cricket -
Taken literally, that means that you have to mow an artifical pitch.Law 10 - Preparation and Maintenanca of the Playing Area
3.Mowing
The pitch shall be mown on each day of the match on which play is expected to take place, if ground and weather conditions allow.
<SNIP>
8.Non-turf pitches
Wherever appropriate, the provisions set out in 1 to 7 shall apply.
However, they stuck the words 'wherever appropriate' in there, so that means you don't have to.