C-Code not found in CDISC Controlled Terminology

Hi, I have this message below, I dont know why, since i confirmed that C66769 goes with AESEV. 

//CodeList[@OID='CL.AESEV']/Alias[1] @Name C66769

my define portion is below.

 </CodeList>

         <CodeList OID="CL.AESEV" Name="Severity/Intensity Scale for Adverse Events"

                   DataType="text">

            <CodeListItem CodedValue="MILD" OrderNumber="1">

               <Decode>

                  <TranslatedText xml:lang="en">Mild Adverse Event</TranslatedText>

               </Decode>

               <Alias Name="C41338" Context="nci:ExtCodeID"/>

            </CodeListItem>

            <CodeListItem CodedValue="MODERATE" OrderNumber="2">

               <Decode>

                  <TranslatedText xml:lang="en">Moderate Adverse Event</TranslatedText>

               </Decode>

               <Alias Name="C41339" Context="nci:ExtCodeID"/>

            </CodeListItem>

            <Alias Name="C66769" Context="nci:ExtCodeID"/>

         </CodeList>

Please advice is the incorrect information is being filled in.