Answer
When Catia V5 files are manipulated, errors can appear, leading to troubles like ghost links. To solve this, the CATDUA (For Catia Data Upward Assistant) exist in the Catia V5 Desk This tool is powerful, but only treat documents one by one which can be painful for users, when dealing with assemblies. So, in order to facilitate the cleaning of models, CATDUAV5 Automation has been developed by support.
To learn more about this process, please refer to the document below.