There is a difference between the name of default kie-server ID between BRMS 6.4 and RHPAM 7.0.

BRMS 6.4
---------------
<property name="org.kie.server.id" value="default-kie-server"/>

RHPAM 7.0
---------------
<property name="org.kie.server.id" value="default-kieserver"/>

In the "Prerequisites" of "Chapter 3" in Migration document for RHPAM 7.0, it mentions RHPAM 7.0 should be installed.

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Red Hat Process Automation Manager 7.0 is installed on a separate instance from Red Hat JBoss BPM Suite 6.4 (on Red Hat JBoss EAP or other instance).
~~~

Documentation should also mention while installing Red Hat Process Automation Manager 7.0, "org.kie.server.id" should be kept the same as BRMS 6.4 "org.kie.server.id", else after running migration there would 2 kie-servers listed causing issue.

Regards,
Sudhish