Negative values in stacked bar

Hi
I am using a custom chart. In one column (stacked bar) I have two values (2 and -1). I would expect the chart to draw one bar up from 0 to 2, and another bar down from 0 to -1 (as Excel would do in this situation).
However what actually happens is it draws the first bar from 0 to -1 then draws the second bar over this from -1 to 1.
As usual, any help is much appreciated, and if you need any further info please just ask.
Nick
PS Here is my data
<?xml version="1.0" encoding="UTF-8" ?>
- <Rowsets DateCreated="2007-10-25T15:47:11" EndDate="2007-10-25T15:47:11" StartDate="2007-10-25T14:47:11" Version="11.5.3">
- <Rowset>
- <Columns>
<Column Description="" MaxRange="1" MinRange="0" Name="DateTime" SQLDataType="93" SourceColumn="DateTime" />
<Column Description="" MaxRange="1" MinRange="0" Name="title" SQLDataType="1" SourceColumn="title" />
<Column Description="" MaxRange="1" MinRange="0" Name="Category" SQLDataType="1" SourceColumn="Category" />
<Column Description="" MaxRange="1" MinRange="0" Name="Qty" SQLDataType="8" SourceColumn="Qty" />
</Columns>
- <Row>
<DateTime>2007-10-20T00:00:00</DateTime>
<title>Prior</title>
<Category>DepReq</Category>
<Qty>-1</Qty>
</Row>
- <Row>
<DateTime>2008-03-15T00:00:00</DateTime>
<title>Post</title>
<Category>DepReq</Category>
<Qty>-1</Qty>
</Row>
- <Row>
<DateTime>2007-10-20T00:00:00</DateTime>
<title>Prior</title>
<Category>PurRqs</Category>
<Qty>0</Qty>
</Row>
- <Row>
<DateTime>2008-03-15T00:00:00</DateTime>
<title>Post</title>
<Category>PurRqs</Category>
<Qty>2</Qty>
</Row>
- <Row>
<DateTime>2007-10-20T00:00:00</DateTime>
<title>Prior</title>
<Category>variance</Category>
<Qty>-1</Qty>
</Row>
- <Row>
<DateTime>2008-03-15T00:00:00</DateTime>
<title>Post</title>
<Category>variance</Category>
<Qty>0</Qty>
</Row>
</Rowset>
</Rowsets>
Here is my Display Template
<?xml version="1.0" encoding="UTF-8"?>
<iChart AxisLabelColumns="title" ChartType="Custom" Decimals.1="0"
Decimals.2="0" Decimals.3="0" GlobalDecimals="0" GlobalMaxRange="30.0"
GlobalMinRange="-10.0" GlobalServerScaling="false"
HorizontalGridColor="#E0E0E0" InterpolateLines="false"
LabelColumns="Category" MaxRange.1="60.0" MaxRange.3="60.0"
MinRange.1="-20.0" MinRange.3="-20.0" PenType.1="StackedBar"
PenType.2="StackedBar" PenType.3="Line" SaveDate="10/25/2007 15:27:33"
ShowHorizontalGrid="false" ShowTagDescription="false"
ShowTimeControl="false" ShowVerticalGrid="false" ThreeD="true"
UseGlobalDecimals="true" UseGlobalRanges="true" ValueColumns="Qty"
Version="11.5.3" XAxisLabelDepth="2" XAxisShowLabels="false"
XAxisThreeD="false" XAxisTicksPerLabel="1" YAxisThreeD="false"
ZeroBasedCenterline="true" ZeroBasedScale="true"/>

Nick,
I would just use the StackedBar mode, since it will do a better job of determining the pseudo pen names you want based upon the data mapping of Category / Title. If there was a particular reason for using Custom mode then please advise.
This DT seems to work just fine with the sample dataset you provided earlier:
<?xml version="1.0" encoding="UTF-8"?><iChart AxisLabelColumns="title" ChartType="StackedBar" GlobalMaxRange="1.0" GlobalMinRange="-1.0" GlobalServerScaling="false" HorizontalGridColor="#E0E0E0" InterpolateLines="false" LabelColumns="Category" SaveDate="11/06/2007 15:05:57" ShowHorizontalGrid="false" ShowMouseTracking="true" ShowTagDescription="false" ShowTimeControl="false" ShowVerticalGrid="false" UseGlobalDecimals="true" UseGlobalRanges="true" ValueColumns="Qty" Version="11.5.3" XAxisShowLabels="false" XAxisThreeD="false" XAxisTicksPerLabel="1" YAxisThreeD="false" YAxisTicksPerLabel="1" ZeroBasedCenterline="true"/>
I would also recommend using "NA" instead of "0" to keep your dataset squared up, unless the values are truly zero. If you are building the dataset in BLS then use the nullnumber expression in the link editor instead of a hardcoded 0. If the dataset comes from a query, the null values should be sufficient.
Regards,
Jeremy

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