diff --git a/src/s1ap/asn1c/asnGenFiles/EXTERNAL.h b/src/s1ap/asn1c/asnGenFiles/EXTERNAL.h
new file mode 100644
index 0000000..4b073c1
--- /dev/null
+++ b/src/s1ap/asn1c/asnGenFiles/EXTERNAL.h
@@ -0,0 +1,65 @@
+/*
+ * Generated by asn1c-0.9.29 (http://lionet.info/asn1c)
+ * From ASN.1 module "ASN1C-UsefulInformationObjectClasses"
+ * 	found in "/users/badhri85/share/asn1c/standard-modules/ASN1C-UsefulInformationObjectClasses.asn1"
+ * 	`asn1c -fcompound-names -fno-include-deps -gen-PER -findirect-choice -pdu=S1AP-PDU`
+ */
+
+#ifndef	_EXTERNAL_H_
+#define	_EXTERNAL_H_
+
+
+#include <asn_application.h>
+
+/* Including external dependencies */
+#include <OBJECT_IDENTIFIER.h>
+#include <NativeInteger.h>
+#include <ObjectDescriptor.h>
+#include <ANY.h>
+#include <OCTET_STRING.h>
+#include <BIT_STRING.h>
+#include <constr_CHOICE.h>
+#include <constr_SEQUENCE.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+/* Dependencies */
+typedef enum EXTERNAL__encoding_PR {
+	EXTERNAL__encoding_PR_NOTHING,	/* No components present */
+	EXTERNAL__encoding_PR_single_ASN1_type,
+	EXTERNAL__encoding_PR_octet_aligned,
+	EXTERNAL__encoding_PR_arbitrary
+} EXTERNAL__encoding_PR;
+
+/* EXTERNAL */
+typedef struct EXTERNAL {
+	OBJECT_IDENTIFIER_t	*direct_reference;	/* OPTIONAL */
+	long	*indirect_reference;	/* OPTIONAL */
+	ObjectDescriptor_t	*data_value_descriptor;	/* OPTIONAL */
+	struct EXTERNAL__encoding {
+		EXTERNAL__encoding_PR present;
+		union EXTERNAL__encoding_u {
+			ANY_t	 single_ASN1_type;
+			OCTET_STRING_t	 octet_aligned;
+			BIT_STRING_t	 arbitrary;
+		} choice;
+		
+		/* Context for parsing across buffer boundaries */
+		asn_struct_ctx_t _asn_ctx;
+	} encoding;
+	
+	/* Context for parsing across buffer boundaries */
+	asn_struct_ctx_t _asn_ctx;
+} EXTERNAL_t;
+
+/* Implementation */
+extern asn_TYPE_descriptor_t asn_DEF_EXTERNAL;
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif	/* _EXTERNAL_H_ */
+#include <asn_internal.h>