Error when Scheduling a Cristal Report versus an Excel Table.

The excel book is located in a folder at the Infoview server.

The report has been published at the  Infoview   

If I use the u2018u2019u2019viewu2019u2019u2019 link at infoview I obtain the results ok.  (Iu2019m not asked for any user/pw)

But

If I try to schedule the report, I always obtain an Error, because it needs a user/pw   

(Error en archivo E:Archivos de programaBusiness ObjectsBusinessObjects Enterprise 11.5DataprocSchedservername.reportjobserver~tmp1da060de63d6960.rpt: No se puede conectar: parámetros de conexión incorrectos. )

Which user/pw does the system ask for?

Thanks!