3246091 - General .NET Exception [f826-f8d9-a0]: Cannot assign 'p:CN=xxxxxx' to SNC Quality. Expects an integer between -1 and 9

You try to open a workbook, after opened the workbook the Analysis for Office buttons become inactive and the error message below appears:

You can find the following entries in the traces:

|ERROR  |AoPlugin |CoSystemInfo.CreateFromXml                                                      |VSTA_Main      | Unknown SystemType found: BW_SYSTEM #
|FATAL  |AoPlugin |Connect.ConnectToExcelApplication                                               |VSTA_Main      | 
Application Exception ([f826-f8d9-a0] / ID-105007):
Could not deserialize the application model[msg.DeserializingAppErr]
   at com.sap.ip.bi.pioneer.core.serializing.CrApplicationSerializingService.DeSerializeApplication(WorkingModes openingPlatform)
   at com.sap.ip.bi.pioneer.excel.models.EaModelWbApplication.AdjustAfterOpen(WorkingModes platform)
   at com.sap.ip.bi.pioneer.excel.main.EaSession.ActivateWorkbook(ICofWorkbook cofWorkbook, EaModelWbApplication existingApp)
   at com.sap.ip.bi.pioneer.excel.main.EaSession.InitExcelSession(IExcelWrapperFactory iExcelWrapperFactory)
   at com.sap.ip.bi.pioneer.shared.addin2007.Connect.ConnectToExcelApplication(ICofApplication cofApplication)

>> 
General .NET Exception [f826-f8d9-a0]:
Cannot assign 'p:CN=xxxxxxxx' to SNC Quality. Expects an integer between -1 and 9
   at com.sap.ip.bi.pioneer.common.connectivity.sytemInfos.CoBwRfcSystemInfo.set_SncQuality(String value)
   at com.sap.ip.bi.pioneer.common.connectivity.sytemInfos.CoBwRfcSystemInfo.Deserialize(XmlNode systemInfoNode)
   at com.sap.ip.bi.pioneer.common.connectivity.sytemInfos.CoSystemInfo.CreateFromXml(XmlNode systemInfoNode)
   at com.sap.ip.bi.pioneer.excel.serializing.EaExcelSerialization.ReadApplicationProperties(XmlNode iApplicationNode)
   at com.sap.ip.bi.pioneer.excel.serializing.EaExcelSerialization.Deserialize(String serializedData)
   at com.sap.ip.bi.pioneer.core.serializing.CrApplicationSerializingService.DeSerializeApplication(WorkingModes openingPlatform)

Analysis for Office 2.8 SP11 and above

SNC Quality, Inactive buttons, AO greyed out, Analysis for Office SNC, stored SNC values. , KBA , BI-RA-AO-XLA , Excel Addin , BI-RA-AO-BIP , AO Precalculation, Scheduling and AO InfoOb... , BI-RA-AO-BPC , BusinessProcessFlow, Workstatus and BPC for AO , Known Error