diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/CodeSystemUtilities.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/CodeSystemUtilities.java
index aa5074afc..3ff4c0560 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/CodeSystemUtilities.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/CodeSystemUtilities.java
@@ -64,6 +64,7 @@ import org.hl7.fhir.r5.model.IntegerType;
 import org.hl7.fhir.r5.model.Meta;
 import org.hl7.fhir.r5.model.StringType;
 import org.hl7.fhir.r5.model.UriType;
+import org.hl7.fhir.r5.utils.CanonicalResourceUtilities;
 import org.hl7.fhir.r5.utils.ToolingExtensions;
 import org.hl7.fhir.utilities.CommaSeparatedStringBuilder;
 import org.hl7.fhir.utilities.MarkDownProcessor;
@@ -504,7 +505,7 @@ public class CodeSystemUtilities extends TerminologyUtilities {
     if (wg != null) {
       if (!ToolingExtensions.hasExtension(cs, ToolingExtensions.EXT_WORKGROUP) || 
           (Utilities.existsInList(ToolingExtensions.readStringExtension(cs, ToolingExtensions.EXT_WORKGROUP), "fhir", "vocab") && !Utilities.existsInList(wg, "fhir", "vocab"))) {
-        ToolingExtensions.setCodeExtension(cs, ToolingExtensions.EXT_WORKGROUP, wg);
+        CanonicalResourceUtilities.setHl7WG(cs, wg);
       }
     }
     if (status != null) {
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/ValueSetUtilities.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/ValueSetUtilities.java
index 87511c494..da3236f95 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/ValueSetUtilities.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/terminologies/ValueSetUtilities.java
@@ -64,6 +64,7 @@ import org.hl7.fhir.r5.model.ValueSet.ValueSetExpansionContainsComponent;
 import org.hl7.fhir.r5.model.ValueSet.ValueSetExpansionPropertyComponent;
 import org.hl7.fhir.r5.terminologies.CodeSystemUtilities.ConceptDefinitionComponentSorter;
 import org.hl7.fhir.r5.terminologies.CodeSystemUtilities.ConceptStatus;
+import org.hl7.fhir.r5.utils.CanonicalResourceUtilities;
 import org.hl7.fhir.r5.utils.ToolingExtensions;
 import org.hl7.fhir.utilities.StandardsStatus;
 import org.hl7.fhir.utilities.Utilities;
@@ -139,7 +140,7 @@ public class ValueSetUtilities extends TerminologyUtilities {
     if (wg != null) {
       if (!ToolingExtensions.hasExtension(vs, ToolingExtensions.EXT_WORKGROUP) || 
           (!Utilities.existsInList(ToolingExtensions.readStringExtension(vs, ToolingExtensions.EXT_WORKGROUP), "fhir", "vocab") && Utilities.existsInList(wg, "fhir", "vocab"))) {
-        ToolingExtensions.setCodeExtension(vs, ToolingExtensions.EXT_WORKGROUP, wg);
+        CanonicalResourceUtilities.setHl7WG(vs, wg);
       }
     }
     if (status != null) {
diff --git a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/CanonicalResourceUtilities.java b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/CanonicalResourceUtilities.java
index 91d924f7b..df1f3b44a 100644
--- a/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/CanonicalResourceUtilities.java
+++ b/org.hl7.fhir.r5/src/main/java/org/hl7/fhir/r5/utils/CanonicalResourceUtilities.java
@@ -6,6 +6,8 @@ import org.hl7.fhir.r5.elementmodel.Element;
 import org.hl7.fhir.r5.model.CanonicalResource;
 import org.hl7.fhir.r5.model.CompartmentDefinition;
 import org.hl7.fhir.r5.model.Constants;
+import org.hl7.fhir.r5.model.ContactDetail;
+import org.hl7.fhir.r5.model.ContactPoint;
 import org.hl7.fhir.r5.model.ContactPoint.ContactPointSystem;
 import org.hl7.fhir.utilities.HL7WorkGroups;
 import org.hl7.fhir.utilities.VersionUtilities;
@@ -14,17 +16,33 @@ import org.hl7.fhir.utilities.xml.XMLUtil;
 public class CanonicalResourceUtilities {
 
   public static void setHl7WG(CanonicalResource cr, String wgc) {
+    if ("http://hl7.org/fhir/days-of-week".equals(cr.getUrl())) {
+      System.out.println("!");
+    }
     var wg = HL7WorkGroups.find(wgc);
     if (wg == null) {
       throw new Error("Unknown WG "+wgc);
     }
     ToolingExtensions.setCodeExtension(cr, ToolingExtensions.EXT_WORKGROUP, wg.getCode());
     cr.setPublisher("HL7 International / "+wg.getName());
-    cr.getContact().clear();
-    cr.addContact().addTelecom().setSystem(ContactPointSystem.URL).setValue(wg.getLink());
+    boolean found = false;
+    for (ContactDetail c : cr.getContact()) {
+      for (ContactPoint t : c.getTelecom()) {
+        if ((t.getSystem() == ContactPointSystem.URL) && wg.getLink().equals(t.getValue())) {
+          found = true;
+        }
+      }
+    }
+    if (!found) {
+      cr.addContact().addTelecom().setSystem(ContactPointSystem.URL).setValue(wg.getLink());
+    }
   }
 
   public static void setHl7WG(CanonicalResource cr) {
+    if ("http://hl7.org/fhir/days-of-week".equals(cr.getUrl())) {
+      System.out.println("!");
+    }
+
     String wgc = ToolingExtensions.readStringExtension(cr, ToolingExtensions.EXT_WORKGROUP);
     if (wgc == null) {
       wgc = "fhir";      
@@ -35,8 +53,17 @@ public class CanonicalResourceUtilities {
     }
     ToolingExtensions.setCodeExtension(cr, ToolingExtensions.EXT_WORKGROUP, wg.getCode());
     cr.setPublisher("HL7 International / "+wg.getName());
-    cr.getContact().clear();
-    cr.addContact().addTelecom().setSystem(ContactPointSystem.URL).setValue(wg.getLink());
+    boolean found = false;
+    for (ContactDetail c : cr.getContact()) {
+      for (ContactPoint t : c.getTelecom()) {
+        if ((t.getSystem() == ContactPointSystem.URL) && wg.getLink().equals(t.getValue())) {
+          found = true;
+        }
+      }
+    }
+    if (!found) {
+      cr.addContact().addTelecom().setSystem(ContactPointSystem.URL).setValue(wg.getLink());
+    }
   }
 
   public static void setHl7WG(Element res, String code) {