I was using Nick Swan's excellent BDC Meta Man to build some definition files for sample SQL DBs to connect to SharePoint.
I was trying to get the Matching Items function working in the Business Data Column, so that a partial entry will return a set of possible matches....
On the main Finder method, generated by BDC Meta Man, I added a filter descriptor to support the UsedForDisambiguation switch, and this seemed to make the difference.
<FilterDescriptors>
<FilterDescriptor Type="Wildcard" Name="Customer Name" >
<Properties>
<Property Name="UsedForDisambiguation"
Type="System.Boolean">true</Property>
</Properties>
</FilterDescriptor></FilterDescriptors>
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