I figured ou myself and would like to share:
To force updating the hostconfiguration the repository has to be bootstrapped.
By default bootstrapping is disabled after first deploy. To enable bootstrapping a parameter in setenv.sh (which is in CATALINA_BASE Directory in my case) must be set to true.
REP_OPTS="-Drepo.bootstrap=true -Drepo.config=file:${CATALINA_BASE}/conf/repository.xml"
To get this working CATALINA_BASE must be set to correct directory (normally /opt/cms/tomcat).
As written in another post Prepare Environment for v14:: Directories the documentation (Configure the application server) is not correct. CATALINA_BASE cannot be set in setenv.sh - must be set in startup-skript!!