diff --git a/src/applications/differential/customfield/DifferentialAuditorsField.php b/src/applications/differential/customfield/DifferentialAuditorsField.php
--- a/src/applications/differential/customfield/DifferentialAuditorsField.php
+++ b/src/applications/differential/customfield/DifferentialAuditorsField.php
@@ -16,7 +16,7 @@
   }
 
   public function getValueForStorage() {
-    return json_encode($this->getValue());
+    return phutil_json_encode($this->getValue());
   }
 
   public function setValueFromStorage($value) {
@@ -28,33 +28,20 @@
     return $this;
   }
 
-  public function shouldAppearInCommitMessage() {
-    return true;
-  }
-
-  public function shouldAllowEditInCommitMessage() {
-    return true;
+  public function renderEditControl(array $handles) {
+    return null;
   }
 
   public function canDisableField() {
     return false;
   }
 
-  public function getRequiredHandlePHIDsForCommitMessage() {
-    return nonempty($this->getValue(), array());
-  }
-
-  public function parseCommitMessageValue($value) {
-    return $this->parseObjectList(
-      $value,
-      array(
-        PhabricatorPeopleUserPHIDType::TYPECONST,
-        PhabricatorProjectProjectPHIDType::TYPECONST,
-      ));
+  public function shouldAppearInEditView() {
+    return true;
   }
 
-  public function renderCommitMessageValue(array $handles) {
-    return $this->renderObjectList($handles);
+  public function shouldAppearInCommitMessage() {
+    return true;
   }
 
   public function shouldAppearInConduitTransactions() {
@@ -65,4 +52,8 @@
     return new ConduitPHIDListParameterType();
   }
 
+  public function shouldAppearInApplicationTransactions() {
+    return true;
+  }
+
 }
diff --git a/src/applications/differential/field/DifferentialAuditorsCommitMessageField.php b/src/applications/differential/field/DifferentialAuditorsCommitMessageField.php
--- a/src/applications/differential/field/DifferentialAuditorsCommitMessageField.php
+++ b/src/applications/differential/field/DifferentialAuditorsCommitMessageField.php
@@ -22,6 +22,14 @@
     return 'phabricator:auditors';
   }
 
+  public function isFieldEditable() {
+    return true;
+  }
+
+  public function isTemplateField() {
+    return false;
+  }
+
   public function readFieldValueFromConduit($value) {
     return $this->readStringListFieldValueFromConduit($value);
   }
diff --git a/src/applications/differential/field/DifferentialCommitMessageField.php b/src/applications/differential/field/DifferentialCommitMessageField.php
--- a/src/applications/differential/field/DifferentialCommitMessageField.php
+++ b/src/applications/differential/field/DifferentialCommitMessageField.php
@@ -182,7 +182,7 @@
   protected function isCustomFieldEnabled($key) {
     $field_list = PhabricatorCustomField::getObjectFields(
       new DifferentialRevision(),
-      PhabricatorCustomField::ROLE_VIEW);
+      DifferentialCustomField::ROLE_COMMITMESSAGE);
 
     $fields = $field_list->getFields();
     return isset($fields[$key]);