Index: modules/path/path.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/path/path.admin.inc,v
retrieving revision 1.45
diff -u -p -r1.45 path.admin.inc
--- modules/path/path.admin.inc	11 Sep 2010 03:04:43 -0000	1.45
+++ modules/path/path.admin.inc	22 Oct 2010 20:57:31 -0000
@@ -151,6 +151,9 @@ function path_admin_form($form, &$form_s
       '#type' => 'submit',
       '#value' => t('Delete'),
       '#submit' => array('path_admin_form_delete_submit'),
+      // Keep array('pid') for passing pid of the
+      // url alias record to delete confirmation form.
+      '#limit_validation_errors' => array(array('pid')),
     );
   }
 
Index: modules/path/path.test
===================================================================
RCS file: /cvs/drupal/drupal/modules/path/path.test,v
retrieving revision 1.41
diff -u -p -r1.41 path.test
--- modules/path/path.test	9 Oct 2010 17:38:41 -0000	1.41
+++ modules/path/path.test	22 Oct 2010 20:57:31 -0000
@@ -160,6 +160,41 @@ class PathTestCase extends DrupalWebTest
     $this->assertResponse(404);
   }
 
+  /**
+   * Delete alias through alias edit form.
+   */
+  function testDeleteAlias() {
+    // Create alias.
+    $alias = $this->randomName();
+    $edit = array(
+      'source' => '<front>',
+      'alias' => $alias,
+    );
+    $this->drupalPost('admin/config/search/path/add', $edit, t('Save'));
+
+    // Select pid of new created alias.
+    $query = db_select('url_alias');
+    $query->addField('url_alias', 'pid');
+    $query->condition('alias', $alias);
+    $pid = $query->execute()->fetchField();
+
+    // Delete submit with empty source field.
+    $edit = array(
+      'source' => '',
+      'alias' => $alias,
+    );
+    $this->drupalPost('admin/config/search/path/edit/' . $pid, $edit, t('Delete'));
+    $this->assertNoText(t('Existing system path field is required.'), t('Delete alias on edit form with empty source field.'));
+
+    // Delete submit with empty alias field.
+    $edit = array(
+      'source' => '<front>',
+      'alias' => '',
+    );
+    $this->drupalPost('admin/config/search/path/edit/' . $pid, $edit, t('Delete'));
+    $this->assertNoText(t('Path alias field is required.'), t('Delete alias on edit form with empty alias field.'));
+  }
+
   function getPID($alias) {
     return db_query("SELECT pid FROM {url_alias} WHERE alias = :alias", array(':alias' => $alias))->fetchField();
   }