Did Bush knowingly sign law that didn't pass?

quote[Representative Henry Waxman (D-CA) has alleged in a letter to White House Chief of Staff Andrew Card that President Bush signed a version of the Budget Reconciliation Act that, in effect, did not pass the House of Representatives.

Further, Waxman says there is reason to believe that the Speaker of the House called President Bush before he signed the law, and alerted him that the version he was about to sign differed from the one that actually passed the House. If true, this would put the President in willful violation of the U.S. Constitution.]

But...the president is above the law, isn't he???