The List_EmployeeEarning.PREarningId reference in the <BindingProperty> section brings the full list of earning codes into focus. You can limit the codes that are available for listing their IDs in the <Filter> section.
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<Field>
<Style>IVComboBox</Style>
<Block>1</Block>
<Row>3</Row>
<Column>3</Column>
<BindingProperty>List_EmployeeEarning.PREarningId</BindingProperty>
<DataProvider>PREarnings</DataProvider>
<DisplayMemberPath>Shortname</DisplayMemberPath>
<SelectedValuePath>Id</SelectedValuePath>
<IsReadOnly>true</IsReadOnly>
<IsRequired>true</IsRequired>
<Filter>
<FieldName>Id</FieldName>
<FieldValue>170</FieldValue>
</Filter>
<InitialValue>170</InitialValue>
</Field>
See also: