Hi Samson,
Check out the SAP note : 1705161 - Parameter Array Fetch Size of universe connection changed to 1 after migrating by Import Wizard from previous version to BusinessOjbects Enterprise XI3.1
This is a known behavior when migrating a universe from BO XIR2 to BO 3.1
It was expected to get fixed in SAP BO 3.1 SP6
Did not get any relevant details regarding BI4.0 though.
It seems that manually modifying the parameter was the only way out here.
Hope this helps !!
Regards,
Monish