REST API - How to update status of ticket when there is no specific transition

[jeremy_bonde]

I am trying to update tickets using rest api but I am not able to change the status from "TO BE INTEGRATED" to "A TESTER". Here is my project workflow :

As you can see, there is no explicit transition linking from TO BE INTEGRATED to A TESTER. All is allowed. 
When I list all transitions for a ticket in the project. The api returns me a json with all transitions, one by status, example for one of them :

{
  "id":"51",
  "name":"A tester",
  "to":[
    "Object"
  ],
  "hasScreen":false,
  "isGlobal":true,
  "isInitial":false,
  "isAvailable":true,
  "isConditional":false,
  "isLooped":false
}

 The content of "to" property is this one :
{
  self: 'atlassian_domain/rest/api/3/status/10030',
  description: 'This status is managed internally by Jira Software',
  iconUrl: 'atlassian_domain',
  name: 'A tester',
  id: '10028',
  statusCategory: {
    self: 'atlassian_domain/rest/api/3/statuscategory/4',
    id: 4,
    key: 'indeterminate',
    colorName: 'yellow',
    name: 'En cours'
  }
}

 I supposed that the "to" is the target status. So my http body looks like this :

{
  "update": {
    "fixVersions":[
      {
        "set":[{"name":"JohnDoe_Version"}]
      }
    ]
  },
  "transition":{"id":"51"}
}

 And the version changes but the status do not... I changed manually my tickets to different status' and I also tried to change the transition id without any success...

There is no error from http request and my version changes correctly so I don't know if the problem comes from the fact that there is no explicit transition between "To be integrated" and "A tester" or if I am doing something wrong.

Thanks

[Martin Bayer _MoroSystems_ s_r_o__]

Hi @jeremy_bonde I just played with it a little. I found out that if you do not need to update any field, you can use REST endpoint https://developer.atlassian.com/cloud/jira/platform/rest/v3/api-group-issues/#api-rest-api-3-issue-issueidorkey-transitions-post

And in case you are using for example Postman, you need to specify "https://" on the beginning of the URL.

Following setup works for me: