diff --git a/src/applications/differential/customfield/DifferentialRepositoryField.php b/src/applications/differential/customfield/DifferentialRepositoryField.php
--- a/src/applications/differential/customfield/DifferentialRepositoryField.php
+++ b/src/applications/differential/customfield/DifferentialRepositoryField.php
@@ -20,107 +20,6 @@
     return $revision->getRepositoryPHID();
   }
 
-  protected function writeValueToRevision(
-    DifferentialRevision $revision,
-    $value) {
-    $revision->setRepositoryPHID($value);
-  }
-
-  public function readValueFromRequest(AphrontRequest $request) {
-    $phids = $request->getArr($this->getFieldKey());
-    $first = head($phids);
-    $this->setValue(nonempty($first, null));
-  }
-
-  public function renderEditControl(array $handles) {
-    if ($this->getValue()) {
-      $value = array($this->getValue());
-    } else {
-      $value = array();
-    }
-
-    return id(new AphrontFormTokenizerControl())
-      ->setUser($this->getViewer())
-      ->setName($this->getFieldKey())
-      ->setDatasource(new DiffusionRepositoryDatasource())
-      ->setValue($value)
-      ->setError($this->getFieldError())
-      ->setLabel($this->getFieldName())
-      ->setLimit(1);
-  }
-
-  public function getApplicationTransactionRequiredHandlePHIDs(
-    PhabricatorApplicationTransaction $xaction) {
-
-    $old = $xaction->getOldValue();
-    $new = $xaction->getNewValue();
-
-    $phids = array();
-    if ($old) {
-      $phids[] = $old;
-    }
-    if ($new) {
-      $phids[] = $new;
-    }
-
-    return $phids;
-  }
-
-  public function getApplicationTransactionTitle(
-    PhabricatorApplicationTransaction $xaction) {
-    $author_phid = $xaction->getAuthorPHID();
-    $old = $xaction->getOldValue();
-    $new = $xaction->getNewValue();
-
-    if ($old && $new) {
-      return pht(
-        '%s changed the repository for this revision from %s to %s.',
-        $xaction->renderHandleLink($author_phid),
-        $xaction->renderHandleLink($old),
-        $xaction->renderHandleLink($new));
-    } else if ($new) {
-      return pht(
-        '%s set the repository for this revision to %s.',
-        $xaction->renderHandleLink($author_phid),
-        $xaction->renderHandleLink($new));
-    } else {
-      return pht(
-        '%s removed %s as the repository for this revision.',
-        $xaction->renderHandleLink($author_phid),
-        $xaction->renderHandleLink($old));
-    }
-  }
-
-  public function getApplicationTransactionTitleForFeed(
-    PhabricatorApplicationTransaction $xaction) {
-
-    $object_phid = $xaction->getObjectPHID();
-    $author_phid = $xaction->getAuthorPHID();
-    $old = $xaction->getOldValue();
-    $new = $xaction->getNewValue();
-
-    if ($old && $new) {
-      return pht(
-        '%s updated the repository for %s from %s to %s.',
-        $xaction->renderHandleLink($author_phid),
-        $xaction->renderHandleLink($object_phid),
-        $xaction->renderHandleLink($old),
-        $xaction->renderHandleLink($new));
-    } else if ($new) {
-      return pht(
-        '%s set the repository for %s to %s.',
-        $xaction->renderHandleLink($author_phid),
-        $xaction->renderHandleLink($object_phid),
-        $xaction->renderHandleLink($new));
-    } else {
-      return pht(
-        '%s removed the repository for %s. (Repository was %s.)',
-        $xaction->renderHandleLink($author_phid),
-        $xaction->renderHandleLink($object_phid),
-        $xaction->renderHandleLink($old));
-    }
-  }
-
   public function shouldAppearInPropertyView() {
     return true;
   }
diff --git a/src/applications/differential/storage/DifferentialTransaction.php b/src/applications/differential/storage/DifferentialTransaction.php
--- a/src/applications/differential/storage/DifferentialTransaction.php
+++ b/src/applications/differential/storage/DifferentialTransaction.php
@@ -37,6 +37,8 @@
           return new DifferentialRevisionTitleTransaction();
         case 'differential:test-plan':
           return new DifferentialRevisionTestPlanTransaction();
+        case 'differential:repository':
+          return new DifferentialRevisionRepositoryTransaction();
       }
     }