When the approvers field is updated, I am trying to automatically add those users to the existing custom field (as it may already contain some users and I want to preserve them, and just add on them)
Be aware, both fields are multi-user fields.
I've tried this and gotten the following error,
Field 'customfield_10561' cannot appear in both 'fields' and 'update')
{
"update": {
"customfield_10561" : [
{
"add": {
"issue.approvers" : [
]}
}
]
}
}