Preventing duplicate post

Does anyone have a suggestion regarding how to prevent duplicate posts with JSF?
As an example, I have one form that allows users to carry out CRUD operations on the data that is being displayed. All successfully processed requests result in a post back to this same page.
I really want to avoid the problems that could occur if a delete or new request gets reposted by an impatient user.
Any suggestions are welcome. I should also note that for scalability reasons, I prefer to avoid solutions which require storing token, etc. in the session. I will settle for such a strategy in the absence of a better solution.

Thanks to all who responded. Just a couple follow-up questions and comments.
1. Can not use Shale. I'm in a heavily restricted corporate environment that limits me to IBM's (poor) implementation of JSF 1.0.
2. Would rather not address the problem soley through the use of JavaScript because users can always disable JavaScript.
3. Redirecting back to the page instead of forwarding back is not practical for three reasons. One, it will require my backing bean to make calls down into my application to retrieve data that would already have been readily available if I were forwarding, and I'm not comfortable with that performance decrease. Two, redirecting back to the form makes displaying of validation errors difficult. Three, redirecting to the page would successfully handle the circumstance where a user hits refresh, but doesn't handle the case of an impatient user who clicks the submit button twice while waiting for a response.
If anyone can propose a solution that works within these constraints, let me know.
Thanks again for those who are contributing.

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I am proposing to use the Reference field as the field for my Invoice Number in my FB60 and FB70 postings. I need to set up a validation rule to ensure that previously posted invoices are prevented from being reposted (i.e. prevent invoice posting duplication). This field is BKPF-XBLNR.
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HI
Double invoice check works as below in standard SAP--
System will check the below fields-
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Occasionally, we see forum users posting duplicate posts across various sub-categories within a category. While not always helpful, this occasionally helps garner inputs from users who would not frequent the original category where the user has already posted his query once. In this sense, I believe that this practice may not always deserve to be frowned upon as the intention may be to have inputs from other set of members.
Having said that, may I suggest an enhancement to the forum (if the underlying technology permits) that would allow a user to swap the sub-category under which his query is posted ? This would allow a user to attempt "moving" his/her post between sub-categories preventing duplicate posts while at the same time providing an option to focus the query to different set of users ?
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This becomes impractical quickly.
What if you can't/don't want to get to the other forum? (Consider that there are sites that are shunned, to the point where people don't want links to raise their google standing. Others are obscure.)
What if you are responding to something before they link to the other forum? The Ranch post was explicit about a delay.
What if some forums don't allow editing?
What about people who blast doc questions to every forum they can or can't spell?
What if some fora have different etiquette? (I remember one day I posted in similar style different questions, one on usenet and one on C$erve. One group flamed me for too little info, the other for too long of a post. Similar things have happened between usenet, lists and fora. And top versus bottom posting...)
Eventually someone says something like "well, use good judgment and post smart questions" which is useless on this topic. The root cause intra-site is arbitrary classifications, and cross-site the capriciousness of the rules.
We shouldn't expect questioners to put in more time than volunteers, there is quite of bit of management implicit in cross-indexing crossposting. People will just get cross :P

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Copyright (c) 1982, 2005, Oracle. All rights reserved.
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This is a duplicate post. Please direct responses to the
original post. You may view the original post by
clicking
here.

Preventing duplicate post

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