Error in webtemplate from Template and in example Composition from Template

[sasurfer]

Configuration information

• EHRbase version:
• openEHR_SDK version:
• Archie version:
• PostgreSQL version:
• Java Runtime version:
• Operating System version:
  "archie": "2.0.1", "ehrbase_version": "0.21.0", "openehr_sdk": "1.19.0"
  "Java": "Oracle Corporation /usr/local/openjdk-11", "JavaVM": "OpenJDK 64-Bit Server VM Oracle Corporation 11.0.15+10", "OS": "Linux amd64 5.11.0-37-generic", "activeProfiles": ["docker"]

Steps to reproduce

Load the following template:
template.zip

Get an example Composition with that template or get the webtemplate form of the template

Actual result

failure 400 {"error":"Bad Request","message":"cannot construct RMObject because of unknown constraint name NOT_SET full constraint CComplexObject: NOT_SET[null]"}

Expected result (Acceptance Criteria)

expected result is an example composition/webtemplate.
(The template has been created with the Template Designer https://tools.openehr.org/designer/ that can export it also in webtemplate form without errors)

Definition of Done

• The defect is checked by an unit or an integration test (Robot)
• Merge Request approved
• Unit tests passed
• Build without errors
• Release notes prepared
• No additional runtime warnings

[sasurfer]

Update: The "NOT_SET" is in the OPT in one rm_object_type field. The OPT is the results of an export from the Archetype Designer(https://tools.openehr.org/designer/). If I change it to "CLUSTER" then everything works (both the example from template and the webtemplate from template). So, the question now is if "NOT_SET" is a valid value still unsupported by EHRBase or an artifact of the designer when the user doesn't set the rm type.