trying to update customfield type: RemoteJiraIssueReference

[ghantaramaseshu]

HI Team,

I'm trying to create automation that updates the custom field of type:RemoteJiraIssueReference through Rest API

Uri : https://jira.{bla.bla}com/rest/api/2/issue/ICON-26046
Method : PUT

The JSON I'm using to update is:

{
 "fields": {
    "customfield_18505": "ENCHG-13405"
 }
}

 
{"errorMessages":["Internal server error"],"errors":{}}

 ENCHG-13405 is Remote Issue 

This is how my custom field values look like in the GET issue :

"customfield_18505": "com.onresolve.scriptrunner.canned.jira.fields.editable.remoteissue.RemoteJiraIssueReference@6a8bc8e0",

I can't see what I'm doing wrong here, I tried many options already but can't figure it out. Did anyone have a similar problem and find a solution?