diff --git a/application/ui.extkeywidget.class.inc.php b/application/ui.extkeywidget.class.inc.php
index b94a9bb96..80c6c8be9 100644
--- a/application/ui.extkeywidget.class.inc.php
+++ b/application/ui.extkeywidget.class.inc.php
@@ -211,14 +211,23 @@ class UIExtKeyWidget
 			$sClassAllowed = $oAllowedValues->GetClass();
 			$bAddingValue = false;
 
+			// N°4792 - load only the required fields
+			$aFieldsToLoad = [];
+
 			$aComplementAttributeSpec = MetaModel::GetNameSpec($oAllowedValues->GetClass(), FriendlyNameType::COMPLEMENTARY);
 			$sFormatAdditionalField = $aComplementAttributeSpec[0];
 			$aAdditionalField = $aComplementAttributeSpec[1];
 
 			if (count($aAdditionalField) > 0) {
 				$bAddingValue = true;
+				$aFieldsToLoad[$sClassAllowed] = $aAdditionalField;
 			}
 			$sObjectImageAttCode = MetaModel::GetImageAttributeCode($sClassAllowed);
+			if (!empty($sObjectImageAttCode)) {
+				$aFieldsToLoad[$sClassAllowed][] = $sObjectImageAttCode;
+			}
+			$aFieldsToLoad[$sClassAllowed][] = 'friendlyname';
+			$oAllowedValues->OptimizeColumnLoad($aFieldsToLoad);
 			$bInitValue = false;
 			while ($oObj = $oAllowedValues->Fetch()) {
 				$aOption = [];
diff --git a/core/dbsearch.class.php b/core/dbsearch.class.php
index f532fb839..74e4feb7f 100644
--- a/core/dbsearch.class.php
+++ b/core/dbsearch.class.php
@@ -1724,4 +1724,16 @@ abstract class DBSearch
 	{
 		$this->SetShowObsoleteData(utils::ShowObsoleteData());
 	}
+
+	/**
+	 * To ease the debug of filters
+	 * @internal
+	 *
+	 * @return string
+	 *
+	 */
+	public function __toString()
+	{
+		return $this->ToOQL();
+	}
 }