This is an example of how to include the LoadMissingPositionLocationFromPrimary tag on a custom form:
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<Field>
<Style>IVCheckBox</Style>
<Block>1</Block>
<Row>8</Row>
<Column>0</Column>
<BindingProperty>LoadMissingPositionLocationFromPrimary</BindingProperty>
<IsRequired>True</IsRequired>
<InitialValue>True</InitialValue>
<Visible>False</Visible>
</Field>