diff --git a/core/bulkchange.class.inc.php b/core/bulkchange.class.inc.php
index 8dd01b6ec3..ad35722812 100644
--- a/core/bulkchange.class.inc.php
+++ b/core/bulkchange.class.inc.php
@@ -550,6 +550,8 @@ protected function PrepareObject(&$oTargetObj, $aRowData, &$aErrors)
 			// if (!array_key_exists($sAttCode, $this->m_aAttList)) continue;
 
 			$oExtKey = MetaModel::GetAttributeDef(get_class($oTargetObj), $sAttCode);
+			//remove any loaded value to avoid problems with data already in memory due to previous operations
+			$oExtKey->RemoveLoaded();
 
 			if ($this->IsNullExternalKeySpec($aRowData, $sAttCode)) {
 				foreach ($aReconKeys as $sReconKeyAttCode => $iCol) {
diff --git a/core/valuesetdef.class.inc.php b/core/valuesetdef.class.inc.php
index 8a9c91494c..3374b5baa3 100644
--- a/core/valuesetdef.class.inc.php
+++ b/core/valuesetdef.class.inc.php
@@ -179,6 +179,11 @@ public function ToObjectSet($aArgs = [], $sContains = '', $iAdditionalValue = nu
 		return new DBObjectSet($oFilter, $this->m_aOrderBy, $aArgs);
 	}
 
+	public function RemoveLoaded()
+	{
+		$this->m_bIsLoaded = false;
+	}
+
 	/**
 	 * @inheritDoc
 	 * @throws CoreException
diff --git a/sources/Core/AttributeDefinition/AttributeExternalKey.php b/sources/Core/AttributeDefinition/AttributeExternalKey.php
index 10783fffb5..7c9b77aa8d 100644
--- a/sources/Core/AttributeDefinition/AttributeExternalKey.php
+++ b/sources/Core/AttributeDefinition/AttributeExternalKey.php
@@ -153,7 +153,13 @@ public function GetValuesDef()
 
 		return $oValSetDef;
 	}
-
+	public function RemoveLoaded()
+	{
+		$oValSetDef = $this->Get("allowed_values");
+		if ($oValSetDef) {
+			$oValSetDef->RemoveLoaded();
+		}
+	}
 	public function GetAllowedValues($aArgs = [], $sContains = '')
 	{
 		//throw new Exception("GetAllowedValues on ext key has been deprecated");