Use the <FilterType> tag with the value of Exclude to indicate options that you want to exclude from a drop-down list.
By default, options that you specify with a filter are included in the drop-down list. If the <FilterType> tag is not included or is included without a value, the values that you specify for the filter are included in the drop-down list.
The following code snippet shows an example of this tag being used in a form:
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<GridColumn>
<BindingProperty>DFUnionId</BindingProperty>
<HeaderCaption>lblDFUnion</HeaderCaption>
<DataProvider>Unions</DataProvider>
<DisplayMemberPath>ShortName</DisplayMemberPath>
<SelectedValuePath>DFUnionId</SelectedValuePath>
<IsRequired>false</IsRequired>
<Filter>
<FieldName>DFUnionId</FieldName>
<FieldValue>6</FieldValue>
<FilterType>Exclude</FilterType>
</Filter>
</GridColumn>