{
    "fields": {
        "project":
        {
            "key": "XXX"
        },
        "summary": "Marketing Advertising",
        "description": {
          "type": "doc",
          "version": 1,
          "content": [
           {
             "type": "paragraph",
             "content": [
              {
                "text": "Analisi e Definizione Contenuti strategico. Analisi della concorrenza, studio della percezione dell'immagine e dell'identità aziendale presso il \"pubblico\", analisi del mercato di appartenenza e conseguente definizione delle strategie di comunicazione e del marketing operativo. Determinazione e definizione dell'organizzazione dei documenti strategici commerciali (Cross media strategy - Concept publishing). Definizione dei contenuti per la la predisposizione delle CH.",
                "type": "text"
              }
             ]
           }
         ]
        },
        "issuetype": {
            "name": "Task"
        }
    }
}{ 
    "fields": {
        "timetracking": [
            {
                "edit": {
                    "originalEstimate": "3d 0h"
                }
            }
        ]
    } 
}{
    "errorMessages": [],
    "errors": {
        "timetracking": "Field 'timetracking' cannot be set. It is not on the appropriate screen, or unknown."
    }
}You need to add TimeTracking to your screens
usually is is enough to set only Default Issue
Thank you for the suggestion and it worked for me.
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Thank you!!!
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I also have this problem. Did you find a solution?
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For adding worklog follow the API here
Let me know if you have any further questions
Thanks,
Pramodh
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Hi @Pramodh Mthis is not useful to me.
I don't want to insert a worklog but an originalEstimate just created the ticket
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Welcome to the community 🙂
Try to include the below body in your request in your edit issue API
"{ "timetracking": [ { "edit": { "remainingEstimate": "4d", "originalEstimate": "1w 1d" } } ] }"
Thanks,
Pramodh
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I @Pramodh M, thanks for your replay but not works. 
I I had already tried adding remainingEstimate but the result message is the same :-(
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