Using the RepositoryGenerator template, alternative registries can be configured in the global override file (e.g. for DockerHub, GCR, Elastic).
In that case the "image" values in the charts will be extended with the configured registry values.
Additionally for each registry a username/password can be configured, which is stored in a registry (onap-docker-registry-key)
This secret must be added to in the charts, which contain the "image" as entry: 
 

This entry is missing in the following chart:
https://git.onap.org/oom/tree/kubernetes/a1policymanagement/templates/statefulset.yaml

Additionally in the same file for envsubstImage the repositoryGenerator should be used:

{{image: "{{ .Values.global.envsubstImage }}"}} -> image: {{ include "repositoryGenerator.image.envsubst" . }}