When v11 works well with creating the external system under cloud region object, it does not work any more with v13 schema.

The test steps is:

1, create cloud region with uri: PUT aai/v13/cloud-infrastructure/cloud-regions/cloud-region/{cloud-owner}/{cloud-region-id}, request body comes along with child node of "esr-system-info-list/esr-system-info"

2, get cloud region with all child nodes with uri: GET aai/v13/cloud-infrastructure/cloud-regions/cloud-region/{cloud-owner}/{cloud-region-id}?depth=all

The observed results is : esr-system-info-list/esr-system-info disappears when operate with schema v13

As the contrast test, the same test steps with aai/v11/... works well.