More than one UNION in a LOV select statment ??

Why can you only have one union in the select code for a LOV?
If I try to union more than two select statements I get ...
1 error has occurred
LOV query is invalid, a display and a return value are needed, the column names need to be different. If your query contains an in-line query, the first FROM clause in the SQL statement must not belong to the in-line query.
Paul P

Opps!
Sorry, I had an error in the 3rd SQL statement. Works fine
PP

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UNION
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summary="#{maintainAssociationUiBundle.CONTAINER_SERIAL_HIERARCHY}">

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More than one UNION in a LOV select statment ??

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