diff --git a/datamodels/2.x/itop-portal-base/portal/web/index.php b/datamodels/2.x/itop-portal-base/portal/web/index.php
index a023d6e66..22be73334 100644
--- a/datamodels/2.x/itop-portal-base/portal/web/index.php
+++ b/datamodels/2.x/itop-portal-base/portal/web/index.php
@@ -50,6 +50,10 @@ $oContex2 = new ContextTag('Portal:' . PORTAL_MODULE_ID);
 
 // Checking if debug param is on
 $bDebug = (isset($_REQUEST['debug']) && ($_REQUEST['debug'] === 'true') );
+if($bDebug)
+{
+    $oContexDebug = new ContextTag('debug');
+}
 
 // Initializing Silex framework
 $oKPI = new ExecutionKPI();
diff --git a/sources/renderer/bootstrap/fieldrenderer/bsselectobjectfieldrenderer.class.inc.php b/sources/renderer/bootstrap/fieldrenderer/bsselectobjectfieldrenderer.class.inc.php
index 59233ecfa..c4e844ba6 100644
--- a/sources/renderer/bootstrap/fieldrenderer/bsselectobjectfieldrenderer.class.inc.php
+++ b/sources/renderer/bootstrap/fieldrenderer/bsselectobjectfieldrenderer.class.inc.php
@@ -28,6 +28,7 @@ use \UserRights;
 use \InlineImage;
 use \DBObjectSet;
 use \MetaModel;
+use \ContextTag;
 use \Combodo\iTop\Renderer\FieldRenderer;
 use \Combodo\iTop\Renderer\RenderingOutput;
 use \Combodo\iTop\Form\Field\SelectObjectField;
@@ -60,6 +61,12 @@ class BsSelectObjectFieldRenderer extends FieldRenderer
 		// Rendering field in edition mode
 		if (!$this->oField->GetReadOnly() && !$this->oField->GetHidden())
 		{
+		    // Debug trace: This is very useful when this kind of field doesn't return the expected values.
+            if(ContextTag::Check('debug'))
+            {
+                IssueLog::Info('Form field #'.$this->oField->GetId().' OQL query: '.$this->oField->GetSearch()->ToOQL(true));
+            }
+
 			// Rendering field
             // - Opening container
 			$oOutput->AddHtml('<div class="form-group form_group_small ' . $sFieldMandatoryClass . '">');