On a SharePoint 2007 environment I have a Data View Web Part that merges the contents of 2 document libraries. The "Enable sorting and filtering on column headers" is set to yes. However when I go to use the filter in the column header it only shows items from 1 of the data sources.
Source A Column
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2
4
Source B Column
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5
DVWP Column
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2
3
4
5
DVWP Column Filter Choices
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2
4
How can I get the filter to show data from both sources?