Product:
Cognos Tm1 10.2.2 (updated version 10.2.5240.167-0)
TM1 Perspective (version 10.2.5200.235-0)
Microsoft Excel 2007
Microsoft Windows 2012 R2

Problem:
When create a WEBSHEET that should call a TM1 TI process with more than one parameter, then when you uploaded/updated to the TM1WEB, the parameters change to only one.
This will make the Process Fail.

Error message in log file:
Error: Prolog procedure line (187): Dimension element not found
or
Error: Prolog procedure line (155): Name “ xxxx “ contains an invalid character.

Solution:
Update you Microsoft Excel 2007 version to Microsoft Office 2007 Fix Pack 3 or later.
Install file like office2007sp3-kb2526086-fullfile-sv-se.exe

TM1 10.2.2 does not demand that Excel 2007 is Fix Pack 3 or later to make it work. But it is needed.

http://www-969.ibm.com/software/reports/compatibility/clarity-reports/report/html/softwareReqsForProduct?deliverableId=1375106724669&osPlatform=Windows#!