CTS RC12 while in STMS transport request

Hi there,

We are encountering some porblem to import a transport request.

The request finished with RC=12 with :

DIImport_ProcessException: Error during runtime system import: com.sap.sl.util.sduread.api.IllFormattedSduFileException: Archive is

neither a SDA nor a SCA (\\sapservercontrolerdomain\sapmnt\trans\data\xxK900003\request.dip).

Frow nwds we can create transport request and from our Abap backend, we can release it.

Could anyone help us ?

thank,

Regards.