diff --git a/library/IPA_Types.ttcn b/library/IPA_Types.ttcn
index e951e10..e0e7521 100644
--- a/library/IPA_Types.ttcn
+++ b/library/IPA_Types.ttcn
@@ -90,7 +90,11 @@
 type record PDU_IPA_CCM {
 	IpaCcmMsgtype	msg_type,
 	IpaCcmUnion	u optional
-} with { variant "" };
+} with { variant (u) "CROSSTAG(
+			get, msg_type = IPAC_MSGT_ID_GET;
+			resp, msg_type = IPAC_MSGT_ID_RESP;
+			other, OTHERWISE;
+	)" };
 
 
 external function enc_PDU_IPA_CCM(in PDU_IPA_CCM pdu) return octetstring