diff --git a/Ieee1609Dot2Dot1Protocol.asn b/Ieee1609Dot2Dot1Protocol.asn
index 78c0489..1bfb644 100644
--- a/Ieee1609Dot2Dot1Protocol.asn
+++ b/Ieee1609Dot2Dot1Protocol.asn
@@ -440,31 +440,35 @@ SignerSelf ::= SignerIdentifier (WITH COMPONENTS {
 --                            Certificate Requests                           --
 --***************************************************************************--
 
+ScmsPdu-RaAcaCertRequest ::= ScmsPdu-Scoped {
+  AcaRaInterfacePdu (WITH COMPONENTS {
+    raAcaCertRequest
+  })
+}
+ScmsPdu-EeEcaCertRequest ::= ScmsPdu-Scoped {
+  EcaEeInterfacePdu (WITH COMPONENTS {
+    eeEcaCertRequest
+  })
+}
+ScmsPdu-EeRaCertRequest ::= ScmsPdu-Scoped {
+  EeRaInterfacePdu (WITH COMPONENTS {
+    eeRaCertRequest
+  })
+}
+ScmsPdu-EeRaSuccessorEnrollmentCertRequest ::= ScmsPdu-Scoped {
+  EeRaInterfacePdu (WITH COMPONENTS {
+    eeRaSuccessorEnrollmentCertRequest
+  })
+}
+
+
 /**
  * @brief This structure defines the all certificate request structures as a
  * scoped version of the ScmsPdu.
  */
 ScopedCertificateRequest ::= ScmsPdu (
-  ScmsPdu-Scoped {
-    AcaRaInterfacePdu (WITH COMPONENTS {
-      raAcaCertRequest
-    })
-  } |
-  ScmsPdu-Scoped {
-    EcaEeInterfacePdu (WITH COMPONENTS {
-      eeEcaCertRequest
-    })
-  } |
-  ScmsPdu-Scoped {
-    EeRaInterfacePdu (WITH COMPONENTS {
-      eeRaCertRequest
-    })
-  } |
-  ScmsPdu-Scoped {
-    EeRaInterfacePdu (WITH COMPONENTS {
-      eeRaSuccessorEnrollmentCertRequest
-    })
-  }
+  ScmsPdu-RaAcaCertRequest | ScmsPdu-EeEcaCertRequest |
+  ScmsPdu-EeRaCertRequest  | ScmsPdu-EeRaSuccessorEnrollmentCertRequest
 )
 
 /**