We present a counter example to a theorem given by Amir etal. [J. Math. Phys. 35, 3005–3012 (1994)]. We also comment on a misleading statement of the same reference.

1.
M.
Jamil Amir
,
A. H.
Bokhari
, and
Asghar
Qadir
,
J. Math. Phys.
35
,
3005
(
1994
).
2.
D. Kramer, H. Stephani, E. Hearlt, and M. A. H. MacCallum, Exact Solutions of Einstein Field Equations (Cambridge University, Cambridge, 1980).
3.
G.
Katzin
,
J.
Levine
, and
W.
Davis
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J. Math. Phys.
10
,
617
(
1969
).
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