Issue - R17 - Schema for abstract processes is not valid

<xsd:complexType name="tOnAlarmEvent">
 <xsd:complexContent>
   <xsd:extension base="tExtensibleElements">
     <xsd:sequence>
       <xsd:choice>
         <xsd:sequence>
           <xsd:group ref="forOrUntilGroup" minOccurs="0"/>
           <xsd:element ref="repeatEvery" minOccurs="0"/>
         </xsd:sequence>
         <xsd:element ref="repeatEvery" minOccurs="0"/>
       </xsd:choice>
       <xsd:element ref="scope" minOccurs="0"/>
     </xsd:sequence>
   </xsd:extension>
 </xsd:complexContent>
</xsd:complexType>