I have an issue with copying single user picker value and multi user picker to multi user picker value.
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.label.LabelManager
import com.atlassian.jira.issue.CustomFieldManager
import com.atlassian.jira.issue.ModifiedValue
import com.atlassian.jira.issue.util.DefaultIssueChangeHolder
import com.atlassian.jira.user.ApplicationUser
import com.atlassian.jira.event.type.EventDispatchOption
CustomFieldManager customFieldManager = ComponentAccessor.getCustomFieldManager()
def currentUser = ComponentAccessor.getJiraAuthenticationContext().getLoggedInUser()
def cfMgr = ComponentAccessor.getCustomFieldManager()
def changeHolder = new DefaultIssueChangeHolder()
def cfMultiSelectUser = cfMgr.getCustomFieldObject("customfield_19221") //multi
def cfMultiSelectUserValue = issue.getCustomFieldValue(cfMultiSelectUser)
def cfSingleSelectUser3 = cfMgr.getCustomFieldObject("customfield_19224") //single
def cfSingleSelectUserValue3 = issue.getCustomFieldValue(cfSingleSelectUser3)
def cfMultiSelectUser2 = cfMgr.getCustomFieldObject("customfield_19223")
def cfMultiSelectUserValue2 = issue.getCustomFieldValue(cfMultiSelectUser2)
cfMultiSelectUserValue2.push(currentUser)
cfMultiSelectUser2.updateValue(null, issue, new ModifiedValue(cfMultiSelectUserValue2, cfMultiSelectUserValue, cfSingleSelectUserValue3),changeHolder)
it is working, but when trying to addition single user picker as the copy field always value is just empty.
