The no-nonsense guide to psions states, "unlike metamagic feats, you can apply the same metapsionic feat to a power more than once. You may have to show your DM the section of the XPH/SRD on applying metapsionic feats to powers." I looked in the XPH and could not find this rule. I also tried a search and couldn't find a discussion of this topic.
Where exactly in the XPH does it say that you can apply the same metapsionic feat to a power more than once? I can't find anything to "show to my DM" in support of this rule.