<AML>
<Item type="MIN_RMA" action="get" select="rma_no" where="[MIN_RMA].id in (SELECT innovator.MIN_RMA.id FROM innovator.MIN_DELIVERED_COMPONENT INNER JOIN innovator.MIN_RMA_PARTS ON innovator.MIN_DELIVERED_COMPONENT.item_number = innovator.CNDF269273.item_number INNER JOIN innovator.MIN_RMA ON innovator.MIN_RMA_PARTS.source_id = innovator.MIN_RMA.id WHERE (innovator.MIN_DELIVERED_COMPONENT.item_number = 'CNDF269273'))"/>
</AML>
Including this SQL inside of a where attribute will allow it to be evaluated as you're expecting. Please note that for security reasons, this kind of AML that uses SQL inside of the where clause will only be allowed to run from the server such as through a Server Method.
Chris