N°931: Fix error reporting for data synchro

core/attributedef.class.inc.php

@@ -6863,6 +6863,20 @@ class AttributeTagSet extends AttributeDBFieldVoid
 		return $this->GetExistingTagsFromString($sValue);
 	}
 
+	/**
+	 * @param $aCols
+	 * @param string $sPrefix
+	 *
+	 * @return mixed
+	 * @throws \Exception
+	 */
+	public function FromImportToValue($aCols, $sPrefix = '')
+	{
+		$sValue = $aCols["$sPrefix"];
+
+		return $this->MakeRealValue($sValue, null);
+	}
+
 	/**
 	 * force an allowed value (type conversion and possibly forces a value as mySQL would do upon writing!
 	 *