If you connect one port in a group, you must connect both the foreign key and primary key ports for the group.

If you connect a foreign key port in a group, you must connect the associated primary key port in the other group. If you do not connect the primary key port of the root group, you do not need to connect the associated foreign key ports in the other groups.

If you use an XML schema with a default attribute value, you must connect the attribute port to create the default attribute in the target. If you pass a null value through the connected port, the Integration Service writes the default value to the target.