Apply Behaviour on Epic Link based on Status .groovy

import com.onresolve.jira.groovy.user.FieldBehaviours
import groovy.transform.BaseScript
import com.atlassian.jira.component.ComponentAccessor
import com.atlassian.jira.issue.Issue
import com.atlassian.jira.issue.IssueManager

@BaseScript FieldBehaviours behaviours
def epicLink = getFieldById(fieldChanged)
def epicLinkValue = epicLink.value as String

def issue = underlyingIssue
def issueManager = ComponentAccessor.getIssueManager() as IssueManager
def createdIssue = issueManager.getIssueObject(issue.id)
def issueStatus =  createdIssue.getStatus().getName() == "To Do" || createdIssue.getStatus().getName() == "In Progress"

if (createdIssue != null && issueStatus) {
    epicLink.clearError()

    if (epicLinkValue) {
        if (epicLinkValue.split(':').last() == 'VTPC-20') {
            epicLink.setError('Invalid')
        }
    }
}