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https://issues.apache.org/jira/browse/OFBIZ-225?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jacques Le Roux closed OFBIZ-225.
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       Resolution: Fixed
    Fix Version/s: SVN trunk

Thanks Amit good work,

Your patch is in trunk revision 606777. In my 1st attempt I forgot that I had 
set  "Y" to include promos in taxes in 2 tax autorithies and not only one.



> Discussion about the interaction between order total promotions and sales 
> taxes
> -------------------------------------------------------------------------------
>
>                 Key: OFBIZ-225
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-225
>             Project: OFBiz
>          Issue Type: Wish
>          Components: order
>            Reporter: Jacopo Cappellato
>            Assignee: Jacques Le Roux
>            Priority: Minor
>             Fix For: SVN trunk
>
>         Attachments: OFBIZ-225.patch, OFBIZ-225.patch
>
>
>  Bug is sales tax adj when there is a promotion applied to the order total.
> I've set up a promotion, 10% applied to the order total, and a sales tax, 20%.
> When I create the order, a sales tax adjustment is attached to every order 
> item without considering the promotion (20%) that is applied to the order 
> total.
> For an example, see the attached picture: the order item subtotal is $500, 
> the sales tax adj (20%) is $100 (!), even if there is a promotion for the 
> order total (50$).
>  All           Comments        Work Log        Change History                 
>   Sort Order: [navigator.ascending.order]
> Comment by David E. Jones [09/Aug/05 10:34 AM]
> [ Permlink ]
> This is an interesting issue, and has been around for a while.
> The main problem is that sales tax is calculated per-item and not per-order, 
> so the adjustments go on each item. For order discounts the only way I can 
> think of to handle them is to pro-rate the discount over each order item 
> based on that item's value relative to the total value of the order. I guess 
> that's not being done now...
> Anyone have any other ideas?
> -David
> Comment by Jacopo Cappellato [09/Aug/05 01:02 PM]
> [ Permlink ]
> My proposal: we could leave everything as is now and at the end we could add 
> a new negative sales tax adjustment to compensate the total sales tax amount.
> Does it make sense?
> Comment by Si Chen [09/Aug/05 01:16 PM]
> [ Permlink ]
> This is not necessarily a bug. Some stores don't give you a promotion on the 
> pre-tax amount. One "solution" is to change the promotion's description to 
> say it is a discount on the after-tax amount.
> If we want to add a discount on the "pre-tax" amount, I think David's 
> suggestion is right. Maybe we should calculate the order item adjustments, 
> all the promotions, order totals. Then calculate the total tax on the order. 
> Then use the order item's value / order total to pro-rate the tax against 
> each item.
> The reason we don't want to add a separate item is if someone returns one of 
> the items, it'll be very hard to track down the effect of returning an item 
> if the adjustments and taxes aren't kept together. 

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