update rechecked condition validation

CRM/Civirules/Form/RuleCondition.php

@@ -136,7 +136,7 @@ class CRM_Civirules_Form_RuleCondition extends CRM_Core_Form {
     $eventEntities = array('contact');
     $eventEntities[] = $event->object_name;
     if (CRM_Civirules_Event_EditEntity::convertObjectNameToEntity($event->object_name) != $event->object_name) {
-      $eventEntities[] = CRM_Civirules_Event_EditEntity::convertObjectNameToEntity($event->object_name);
+      $eventEntities[] = strtolower(CRM_Civirules_Event_EditEntity::convertObjectNameToEntity($event->object_name));
     }
 
     foreach($requiredEntities as $entity) {

CRM/CivirulesConditions/FirstContribution.php

@@ -48,4 +48,14 @@ class CRM_CivirulesConditions_FirstContribution extends CRM_Civirules_Condition
   public function getExtraDataInputUrl($ruleConditionId) {
     return FALSE;
   }
+
+  /**
+   * Returns an array with required entity names
+   *
+   * @return array
+   * @access public
+   */
+  public function requiredEntities() {
+    return array('Contribution');
+  }
 }
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