diff --git a/dcmnet/libsrc/dulpres.cc b/dcmnet/libsrc/dulpres.cc
@@ -66,7 +66,7 @@
 #include "dcmtk/dcmnet/cond.h"
 #include "dcmtk/dcmnet/lst.h"
 #include "dcmtk/dcmnet/dul.h"
-#include "dulstruc.h"
+#include "dcmtk/dcmnet/dulstruc.h"
 #include "dulpriv.h"
 #include "dulfsm.h"
 

diff --git a/dcmnet/libsrc/helpers.cc b/dcmnet/libsrc/helpers.cc
@@ -0,0 +1,71 @@
+/*
+ *
+ *  Copyright (C) 2021, OFFIS e.V.
+ *  All rights reserved.  See COPYRIGHT file for details.
+ *
+ *  This software and supporting documentation were partly developed by
+ *
+ *    OFFIS e.V.
+ *    R&D Division Health
+ *    Escherweg 2
+ *    D-26121 Oldenburg, Germany
+ *
+ *
+ *  Module: dcmnet
+ *
+ *  Author: Michael Onken
+ *
+ *  Purpose: Collection of helper functions
+ *
+ */
+
+#include "dcmtk/dcmnet/helpers.h"
+#include "dcmtk/dcmnet/lst.h"
+#include "dcmtk/dcmnet/assoc.h"
+#include "dcmtk/dcmnet/dulstruc.h"
+
+
+void
+destroyPresentationContextList(LST_HEAD ** l)
+{
+    PRV_PRESENTATIONCONTEXTITEM
+    * prvCtx;
+    DUL_SUBITEM
+        * subItem;
+
+    if (*l == NULL)
+        return;
+
+    prvCtx = (PRV_PRESENTATIONCONTEXTITEM*)LST_Dequeue(l);
+    while (prvCtx != NULL) {
+        subItem = (DUL_SUBITEM*)LST_Dequeue(&prvCtx->transferSyntaxList);
+        while (subItem != NULL) {
+            free(subItem);
+            subItem = (DUL_SUBITEM*)LST_Dequeue(&prvCtx->transferSyntaxList);
+        }
+        LST_Destroy(&prvCtx->transferSyntaxList);
+        free(prvCtx);
+        prvCtx = (PRV_PRESENTATIONCONTEXTITEM*)LST_Dequeue(l);
+    }
+    LST_Destroy(l);
+}
+
+void
+destroyUserInformationLists(DUL_USERINFO * userInfo)
+{
+    PRV_SCUSCPROLE
+    * role;
+
+    role = (PRV_SCUSCPROLE*)LST_Dequeue(&userInfo->SCUSCPRoleList);
+    while (role != NULL) {
+        free(role);
+        role = (PRV_SCUSCPROLE*)LST_Dequeue(&userInfo->SCUSCPRoleList);
+    }
+    LST_Destroy(&userInfo->SCUSCPRoleList);
+
+    /* extended negotiation */
+    delete userInfo->extNegList; userInfo->extNegList = NULL;
+
+    /* user identity negotiation */
+    delete userInfo->usrIdent; userInfo->usrIdent = NULL;
+}