Index: DOM/LEV/impl/DataM/DataMToeleveringAPI.cls.xml
===================================================================
diff -u -r1075 -r3701
--- DOM/LEV/impl/DataM/DataMToeleveringAPI.cls.xml	(.../DataMToeleveringAPI.cls.xml)	(revision 1075)
+++ DOM/LEV/impl/DataM/DataMToeleveringAPI.cls.xml	(.../DataMToeleveringAPI.cls.xml)	(revision 3701)
@@ -8,10 +8,23 @@
 <Method name="GeefToelevering">
 <FormalSpec>ToeleveringNummer:%Integer</FormalSpec>
 <ReturnType>DOM.LEV.Toelevering</ReturnType>
-<Implementation><![CDATA[	Quit ##class(DOM.LEV.impl.DataM.DataMToelevering).%New(ToeleveringNummer)
+<Implementation><![CDATA[
+	If ('..BestaatToelevering(ToeleveringNummer))
+	{
+		Do ##class(TECH.ExceptionHandler).Throw(##class(TECH.Exceptions.InvalidInputException).%New("Toelevering "_ToeleveringNummer_" bestaat niet!"))
+	}
+	
+	Quit ##class(DOM.LEV.impl.DataM.DataMToelevering).%New(ToeleveringNummer)
 ]]></Implementation>
 </Method>
 
+<Method name="BestaatToelevering">
+<FormalSpec>ToeleveringNummer:%Integer</FormalSpec>
+<ReturnType>%Boolean</ReturnType>
+<Implementation><![CDATA[	Quit $Data(^KTO1(ToeleveringNummer))
+]]></Implementation>
+</Method>
+
 <Method name="GeefLeverancier">
 <FormalSpec>LeverancierNummer:%Integer</FormalSpec>
 <ReturnType>DOM.LEV.Leverancier</ReturnType>