Schema cannot be saved in admin UI

[michbart]

When saving managed object's schema, operation ends with following error. Even when the schema wasn't changed, the error appears.

RepoDelegate.js?v=6.0.1:43 Uncaught TypeError: Cannot read properties of undefined (reading '_id')
    at AbstractDelegate.obj.getRepoTypeFromConfig (RepoDelegate.js?v=6.0.1:43)
    at saveManagedObject (AbstractManagedView.js?v=6.0.1:39)
    at saveManagedSchema (SchemaEditorView.js?v=6.0.1:197)
    at HTMLFormElement.r (lodash-3.10.1-min.js?v=6.0.1:26)
    at HTMLDivElement.dispatch (jquery-2.1.1-min.js?v=6.0.1:3)
    at HTMLDivElement.r.handle (jquery-2.1.1-min.js?v=6.0.1:3)

When saving schema with custom policy, following error appears.

Uncaught TypeError: Cannot set properties of undefined (setting 'isVirtual')
    at s.<anonymous> (AbstractManagedView.js?v=6.0.1:120)
    at r (lodash-3.10.1-min.js?v=6.0.1:26)
    at Pn (lodash-3.10.1-min.js?v=6.0.1:9)
    at Function.<anonymous> (lodash-3.10.1-min.js?v=6.0.1:30)
    at s.combineSchemaAndProperties (AbstractManagedView.js?v=6.0.1:118)
    at saveManagedObject (AbstractManagedView.js?v=6.0.1:35)
    at saveManagedSchema (SchemaEditorView.js?v=6.0.1:197)
    at HTMLFormElement.r (lodash-3.10.1-min.js?v=6.0.1:26)
    at HTMLDivElement.dispatch (jquery-2.1.1-min.js?v=6.0.1:3)
    at HTMLDivElement.r.handle (jquery-2.1.1-min.js?v=6.0.1:3)

[karelmaxa]

There is a problem with the configuration endpoint (i.e. ConfigObjectService).

For a READ request, the data is returned:

HTTP GET /openidm/config
{
  "_id" : "",
  "configurations" : [
    ...
    {
      "_id" : "repo.jdbc",
      "pid" : "repo.jdbc",
      "factoryPid" : null
    },
    ...
  ]
}

For a QUERY request, the data is never returned (with any filter):

HTTP GET '/openidm/config?_queryFilter=true'
{
  "result" : [ ],
  "resultCount" : 0,
  "pagedResultsCookie" : null,
  "totalPagedResultsPolicy" : "NONE",
  "totalPagedResults" : -1,
  "remainingPagedResults" : -1
}

Admin UI performs QUERY operation in RepoDelegate.js#L35.