How do I copy a single choice fields value to a multi choice field

[Thorsten Witt]

Using project automatisation I would like to copy the value of a custom single-choice field (cf_11003) to another custom field. This custom field is of the type multi-choice (cf_11600) and has the same values as cf_11003.

I tried using:

{
  "fields": {
    "Kunden-Projekt": {
      "value": "{{issue.parent.fields.customfield_11600.value.asJsonStringArray}}"
    }
  }
}

With this code I get the following error:

(data was not an array (Kunden-Projekt)) 

Any advice on how to solve this issue?

[Thomas Deiler]

Dear @Thorsten Witt ,

I have no clue about Automation, but probably this helps:

Selecting a single option for a multi select field would look like this in pure JSON:

{
  "fields": {
    "customfield_11600": [
      {
        "value": "Project X"
      }
    ]
  }
}

I guess that 

{{issue.parent.fields.customfield_11600.value.asJsonStringArray}}

will return

[
  {
    "value": "Project X"
  },
  {
    "value": Project Y"
  }
]

But when you substitute this in your upper example, it can't work.

Can you output

{{issue.parent.fields.customfield_11600.value.asJsonStringArray}}

in a log file for debugging? And from the logic, don't you need to use this instead?

{{issue.parent.fields.customfield_11003.value.asJsonStringArray}}

So long

Thomas