Remember that the point is that the parties 1) drafted an ineffective provision or 2) OVERLOOKED something that they meant to or would have provided for. That's why the provision will go on to say that the parties can supplement with a provision that reflects their business intentions at the time of contracting.
Misleading and inaccurate to say "deficient." There was a meeting of the minds, there was consideration, etc.

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Note added at 2003-02-02 18:07:17 (GMT)
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To be clear: The customary practice is to use both TOGETHER, \"gaps or omissions.\"

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Note added at 2003-02-02 23:25:38 (GMT)
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Here\'s a pretty typical pair:

§ 22 Salvatorische Klausel

Sollte eine Bestimmung dieses Vertrages unwirksam sein oder werden oder sollte sich im Vertragstext eine Lücke herausstellen, so wird dadurch der Vertrag in seinen übrigen Teilen nicht berührt. Beide Vertragspartner sind verpflichtet, in allen solchen Fällen an einer Neufassung der unwirksamen Bestimmungen mitzuwirken, bzw. an der notwendigen Ergänzung des Vertragstextes, damit rechtswirksam vereinbart wird, was beide Parteien bei einem Vertragsabschluß gewollt haben würden, sofern sie diesen Punkt nicht bedacht hätten.


§ 22 Savings Clause

Should a [any] provision of this Agreement be or become unenforceable, or should its text be found to contain gaps or omissions, the remaining terms of this Agreement shall be unaffected thereby. In all such cases, both parties hereto must cooperate to modify the unenforceable provisions or to supplement the contract text with an enforceable provision consistent with the parties’ intention at the time of contracting, had they not overlooked the point.