Scheduling Analysis for Office.. Error message: precalculation of instance

Hello together,

We're using:

SAP BusinessObjects BI-Plattform 4.0  SP2 Patch 16 (14.0.2.703)

SAP BusinessObjects Analysis 1.4, , Edition für Microsoft Office - Add-On für BI-Plattform 4.1 (1.4.0.167)

on the Server

and

Analysis for MS Office 1.4 on the client

SSO between the SAP BO 4.0 SP2 Server and the SAP/BW System is enabled.

Now we are trying to schedule a workbook for precalculation and we are getting the following error:

precalculation of instance <number> failed with error 31

I haven't found any hints for that or for another error message for Analysis for MS Office

regards

Ralph.