diff --git a/calendar/js/CalendarOwner.ts b/calendar/js/CalendarOwner.ts
index 3f22581293..9d68facd31 100644
--- a/calendar/js/CalendarOwner.ts
+++ b/calendar/js/CalendarOwner.ts
@@ -57,6 +57,25 @@ export class CalendarOwner extends Et2StaticSelectMixin(Et2Select)
 		this.searchOptions['checkgrants'] = true;
 	}
 
+	/**
+	 * Some [part of a] value is missing from the available options, but should be there, so find and add it.
+	 *
+	 * This is used when not all options are sent to the client (search, link list).  Ideally we want to send
+	 * the options for the current value, but sometimes this is not the best option so here we search or create
+	 * the option as needed.  These are not free entries, but need to match some list somewhere.
+	 *
+	 * @param {string} newValueElement
+	 * @protected
+	 */
+	protected _missingOption(newValueElement : string)
+	{
+		// Call ajax_owner
+		return this.egw().request(this.egw().link(this.egw().ajaxUrl(this.egw().decodePath("calendar_owner_etemplate_widget::ajax_owner"))),
+			[newValueElement]).then((results) =>
+		{
+			return this._processResultCount(results);
+		});
+	}
 	/**
 	 * Override parent to show email address in options
 	 *