diff --git a/104144/schema/xsd/ts_104144_EPOCAdditionalInfo.xsd b/104144/schema/xsd/ts_104144_EPOCAdditionalInfo.xsd
index d56b966df95884d6153d48240f7ea105c3739361..1668ee0e3ffa4b7ae47d64a4b2ab8e7a726124ae 100644
--- a/104144/schema/xsd/ts_104144_EPOCAdditionalInfo.xsd
+++ b/104144/schema/xsd/ts_104144_EPOCAdditionalInfo.xsd
@@ -30,7 +30,7 @@
     </xs:complexType>
     <xs:complexType name="UnderlyingConditions">
         <xs:sequence>
-            <xs:element name="UnderlyingConditions" type="ListOfUnderlyingConditions" minOccurs="0"/>
+            <xs:element name="UnderlyingConditions" type="ListOfUnderlyingConditions"/>
             <xs:element name="OffenseClassification" type="etsi:LongString"/>
             <xs:element name="AdditionalUnderlyingConditionsInformation" type="etsi:LongString" minOccurs="0"/>
         </xs:sequence>
@@ -54,10 +54,10 @@
     <xs:complexType name="RelatedRequest">
         <xs:sequence>
             <xs:element name="RequestInBand" type="xs:boolean"/>
-            <xs:element name="InstrumentType" type="common:DictionaryEntry" minOccurs="0"/>
+            <xs:element name="InstrumentType" type="common:DictionaryEntry"/>
             <xs:element name="ExternalIdentifier" type="etsi:LongString" minOccurs="0"/>
-            <xs:element name="IssuerDetails" type="RelatedRequestPartyInformation" minOccurs="0"/>
-            <xs:element name="AddresseeDetails" type="RelatedRequestPartyInformation" minOccurs="0"/>
+            <xs:element name="IssuerDetails" type="RelatedRequestPartyInformation"/>
+            <xs:element name="AddresseeDetails" type="RelatedRequestPartyInformation"/>
             <xs:element name="CompetentAuthorityDetails" type="RelatedRequestPartyInformation" minOccurs="0"/>
             <xs:element name="IssuedOn" type="etsi:QualifiedDateTime" minOccurs="0"/>
             <xs:element name="TransmittedOn" type="etsi:QualifiedDateTime" minOccurs="0"/>