Section 274(2)--
omit, insert--
'(2) If the obligation arose because of a combination of any of the following activities carried out by different persons each of them must be a party to the application--
(a) the exercise of the underground water rights for 1 or more petroleum tenures;
(b) the taking of water necessarily taken as part of petroleum production under 1 or more 1923 Act petroleum tenures.'.