Error 'standard_id' when using the export-file-stix connector v6.1.10 on a report that contains nested relationships

[fboissel]

Description

The export-file-stix connector v6.1.10 generate an error 'standard_id' when trying to export a report which contains nested relationships (e.g. Sample relationship between a Malware SDO and a File SCO). The connector doesn't seem to be able to retrieve a standard_id for these entities. I am not sure that STIX2.1 is attributing an id to these nested relationships:
"The sample_refs property specifies a list of identifiers of the SCO file or artifact objects associated with this malware instance(s) or family."(https://docs.oasis-open.org/cti/stix/v2.1/csprd01/stix-v2.1-csprd01.html#_Toc16070645)

Environment

1. OS (where OpenCTI server runs): docker
2. OpenCTI version: 6.1.10
3. OpenCTI client: python

Reproducible Steps

Steps to create the smallest reproductible scenario:

1. Create a report
2. Add a Maware SDO
3. Add a File SCO
4. Create a Nested relationship between Malware and File, with a relationship type: Sample
5. In the Data tab of the Report, generate an application/json export using the export-file-stix connector for v6.1.10

Expected Output

We are expecting to generate a json file in STIX of the report that we can download.

Actual Output

Connector error: "KeyError: 'standard_id"

Additional information

Screenshots (optional)

[nino-filigran]

@fboissel can you try to upgrade your openCTI version to the latest?
I can't seem to reproduce your issue in our environment.

[fboissel]

Hi @nino-filigran
Sorry for the late answer, the process to get our platform upgraded took a while.
I confirm that an upgrade of OpenCTI to the v6.2.5 with the compatible export connectors solved the problem.
I think this issue can be close as resolved.
Thanks a lot!
Fred