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https://issues.apache.org/jira/browse/OFBIZ-3666?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12855435#action_12855435
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Adrian Crum commented on OFBIZ-3666:
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No, the type conversion hasn't changed. The issue is there is no type to 
convert to. Quantity should be a type, and Money should be a type. Strong data 
typing would prevent applying quantity precision to a money, and money 
precision to a quantity.


> Errors attempting to use quantities with more than 2 decimals of precision
> --------------------------------------------------------------------------
>
>                 Key: OFBIZ-3666
>                 URL: https://issues.apache.org/jira/browse/OFBIZ-3666
>             Project: OFBiz
>          Issue Type: Bug
>          Components: order, product
>    Affects Versions: SVN trunk
>            Reporter: Bob Morley
>            Priority: Minor
>             Fix For: SVN trunk
>
>         Attachments: OFBIZ-3666_DoNotRoundPreciseQuantity.patch
>
>
> We have a need to handle inventory items with quantities up to four decimal 
> places.  The data model currently supports 6 decimals so I thought I would 
> try to complete a purchase order, sales order, and a return for an item that 
> has this many digits of precision.  What I found was ...
> - The order item was calculated properly (including the total for the line) 
> but the totals for the entire sales order were incorrect.  This was because 
> when OrderReadHelper was getting the OrderItemQuantity as part of calculating 
> the subtotal it would round it to the order's configured scale (2).  Since 
> this is being used as a calculation it should not be rounded -- the total 
> itself should be rounded.
> - In a number of spots in issuance and reservation services values were 
> (sometimes) being rounded.  For example, when an order item was created it 
> would create an InventoryItemDetail record that would reduce the ATP by the 
> precise quantity, however when the order was placed the QOH was reduced by 
> the rounded value.  All of these issues were the result of the mini-lang 
> calculate element being used which by default uses a scale of 2 decimals 
> (from the dtd).  The solution was when working with quantities pass in the 
> precision scale (6) to ensure we do not lose precision.  Again, when order 
> totals, taxes, things like that are being done the configured scale should 
> take over, but the intermediate calculations should not be losing precision.

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