diff --git a/src/AasxCsharpLibrary/AdminShellPackageEnv.cs b/src/AasxCsharpLibrary/AdminShellPackageEnv.cs
index 2d862f92..71080f59 100644
--- a/src/AasxCsharpLibrary/AdminShellPackageEnv.cs
+++ b/src/AasxCsharpLibrary/AdminShellPackageEnv.cs
@@ -1540,8 +1540,9 @@ public ListOfAasSupplementaryFile GetListOfSupplementaryFiles()
 
                 // get the origin from the package
                 PackagePart originPart = null;
-                xs = _openPackage.GetRelationshipsByType(
-                    "http://admin-shell.io/aasx/relationships/aasx-origin");
+                xs = _openPackage.GetRelationshipsByType("http://admin-shell.io/aasx/relationships/aasx-origin");
+                var test = xs.Count();
+                if(xs.Count() <= 0) xs = _openPackage.GetRelationshipsByType("http://www.admin-shell.io/aasx/relationships/aasx-origin");
                 foreach (var x in xs)
                     if (x.SourceUri.ToString() == "/")
                     {
@@ -1558,7 +1559,8 @@ public ListOfAasSupplementaryFile GetListOfSupplementaryFiles()
                 {
                     // get the specs from the origin
                     PackagePart specPart = null;
-                    xs = originPart.GetRelationshipsByType("http://www.admin-shell.io/aasx/relationships/aas-spec");
+                    xs = originPart.GetRelationshipsByType("http://admin-shell.io/aasx/relationships/aas-spec");
+                    if(xs.Count() <= 0) xs = originPart.GetRelationshipsByType("http://www.admin-shell.io/aasx/relationships/aas-spec");
                     foreach (var x in xs)
                     {
                         //specPart = _openPackage.GetPart(x.TargetUri);
@@ -1573,8 +1575,8 @@ public ListOfAasSupplementaryFile GetListOfSupplementaryFiles()
                     if (specPart != null)
                     {
                         // get the supplementaries from the package, derived from spec
-                        xs = specPart.GetRelationshipsByType("http://www.admin-shell.io/aasx/relationships/aas-suppl");
-                        if(xs == null) xs = specPart.GetRelationshipsByType("http://www.admin-shell.io/aasx/relationships/aas-suppl");
+                        xs = specPart.GetRelationshipsByType("http://admin-shell.io/aasx/relationships/aas-suppl");
+                        if(xs.Count() <= 0) xs = specPart.GetRelationshipsByType("http://www.admin-shell.io/aasx/relationships/aas-suppl");
                         foreach (var x in xs)
                         {
                             result.Add(