diff --git a/cii/schematron/CII/EN16931-CII-syntax.sch b/cii/schematron/CII/EN16931-CII-syntax.sch
index b6e0a349..fcb497a4 100644
--- a/cii/schematron/CII/EN16931-CII-syntax.sch
+++ b/cii/schematron/CII/EN16931-CII-syntax.sch
@@ -358,6 +358,8 @@
 	<param name="CII-SR-450" value="(not(ram:BuyerTradeParty/ram:ID) and ram:BuyerTradeParty/ram:GlobalID) or (ram:BuyerTradeParty/ram:ID and not(ram:BuyerTradeParty/ram:GlobalID)) or (not(ram:BuyerTradeParty/ram:ID) and not(ram:BuyerTradeParty/ram:GlobalID))"/>
 	<param name="CII-SR-455" value="( count(ram:SellerTradeParty/ram:DefinedTradeContact)  &lt;= 1)"/>
 	<param name="CII-SR-456" value="( count(ram:BuyerTradeParty/ram:DefinedTradeContact)  &lt;= 1)"/>
+	<param name="CII-SR-457" value="( count(ram:AdditionalReferencedDocument[ram:TypeCode='50'])  &lt;= 1)"/>
+	<param name="CII-SR-458" value="( count(ram:AdditionalReferencedDocument[ram:TypeCode='130'])  &lt;= 1)"/>
 	
 	<!-- ApplicableHeaderTradeDelivery -->
 	<param name="CII-SR-308" value="not(ram:RelatedSupplyChainConsignment)"/>
diff --git a/cii/schematron/abstract/EN16931-CII-syntax.sch b/cii/schematron/abstract/EN16931-CII-syntax.sch
index c4cf7010..aeab7692 100644
--- a/cii/schematron/abstract/EN16931-CII-syntax.sch
+++ b/cii/schematron/abstract/EN16931-CII-syntax.sch
@@ -372,6 +372,9 @@
 		<assert test="$CII-SR-450" flag="warning" id="CII-SR-450">[CII-SR-450] - Only one  buyer identifier should be present (either the ID or the Global ID)</assert>
 		<assert test="$CII-SR-455" flag="fatal" id="CII-SR-455">[CII-SR-455] - DefinedTradeContact of SellerTradeParty shall exist maximum once</assert>
 		<assert test="$CII-SR-456" flag="fatal" id="CII-SR-456">[CII-SR-456] - DefinedTradeContact of BuyerTradeParty shall exist maximum once</assert>
+		<assert test="$CII-SR-457" flag="warning" id="CII-SR-457">[CII-SR-457] - IssuerAssignedID with TypeCode 50 should exist maximum once</assert>
+		<assert test="$CII-SR-458" flag="warning" id="CII-SR-458">[CII-SR-458] - IssuerAssignedID with TypeCode 130 should exist maximum once</assert>
+		
 	</rule>
 	<rule context="$ApplicableHeaderTradeDelivery ">
 		<assert test="$CII-SR-308" flag="warning" id="CII-SR-308">[CII-SR-308] - RelatedSupplyChainConsignment should not be present</assert>