[TASK] Fill refindex with content - form relation

Flexform just needs the foreign_table configuration

Related: #1331

Author: Mabahe

Configuration/FlexForms/FlexformPi1.xml

@@ -13,6 +13,7 @@
 						<config>
 							<type>select</type>
 							<renderType>selectMultipleSideBySide</renderType>
+                            <foreign_table>tx_powermail_domain_model_form</foreign_table>
 							<minitems>1</minitems>
 							<maxitems>1</maxitems>
 							<wizards>