Error when importing project with iteration cadence

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Group/project structure

Group (ultimate)
|- Cadence
   |- Iteration --|
|- Project        |
   |- Issue ------|

Importing project into same group

1. Export the project.
2. Re-import the project into the same group.

Outcome: project imports, and issue is connected to the correct iteration. Error in logs from attempting to create new iteration cadence:

{
  "feature_category": "importers",
  "severity": "WARN",
  "time": "2024-08-28T13:02:39.008Z",
  "correlation_id": "01J6CH9CWHV37B672AWNT4E4YS",
  "meta.caller_id": "RepositoryImportWorker",
  "meta.remote_ip": "127.0.0.1",
  "meta.feature_category": "importers",
  "meta.user": "root",
  "meta.user_id": 1,
  "meta.project": "cadence-test/cadence-import-2",
  "meta.root_namespace": "cadence-test",
  "meta.client_id": "user/1",
  "meta.root_caller_id": "Import::GitlabProjectsController#create",
  "message": "[Project/Group Import] Invalid object relation built",
  "relation_key": "iterations_cadence",
  "relation_index": 0,
  "relation_class": "Iterations::Cadence",
  "error_messages": "Start date can't be blank. Group can't be blank. Duration in weeks can't be blank. Iterations in advance can't be blank"
}

Importing project into new ultimate group

Outcome: Same error in logs, no iteration or cadence created at group level.

{
  "feature_category": "importers",
  "severity": "WARN",
  "time": "2024-08-28T13:56:14.134Z",
  "correlation_id": "01J6CMBGSH64HKMQCXB7ESDM01",
  "meta.caller_id": "RepositoryImportWorker",
  "meta.remote_ip": "127.0.0.1",
  "meta.feature_category": "importers",
  "meta.user": "root",
  "meta.user_id": 1,
  "meta.project": "cadence-import-2/group-with-no-iteration",
  "meta.root_namespace": "cadence-import-2",
  "meta.client_id": "user/1",
  "meta.root_caller_id": "Import::GitlabProjectsController#create",
  "message": "[Project/Group Import] Invalid object relation built",
  "relation_key": "iterations_cadence",
  "relation_index": 0,
  "relation_class": "Iterations::Cadence",
  "error_messages": "Start date can't be blank. Group can't be blank. Duration in weeks can't be blank. Iterations in advance can't be blank"
}

Suspected factors

• An iteration cadence must belong to a group. If importing iteration cadences should be supported, we need to either connect them to the group into which the project is being imported, or some parent group.
• If a project is being imported into the group it came from, the iteration may not need to be re-created.
• start_date, duration_in_weeks and iterations_in_advance are only validated if automatic is set to true. automatic isn't in the exported fields, but defaults to true, so no cadences without these values are importable.