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import com.atlassian.jira.component.*;
2importimport com.atlassian.jira.issue.*;
3importimport com.atlassian.jira.issue.fields.*;
4
5defdef customFieldManager = ComponentAccessor.getCustomFieldManager()
6defdef cfValue = worklog.issue.getCustomFieldValue(customFieldManager.getCustomFieldObjectByName("Single Line Text"))
7 
8ifif (cfValue == null) {
9    return "You have to provide a value for 'Single Line Text' custom field."
10}