Running Sum syntax in BO 4.1

Hi,

I have a webi report created in BO 4.0 version. The report is a crosstab and contains variables for running sum. The variable syntax looks like

=RunningSum(If IsNull([measure]) Then 0 Else ([measure]);Row;([dimension1];[dimension2]))

But when the BO got upgraded from 4.0 to 4.1 the above variable does not calculate the running sum as expected.

When I changed the variable to below formula it is now working fine and gives correct running sum value.

=RunningSum(If IsNull([measure]) Then 0 Else ([measure]);Col;([dimension1];[dimension2]))

Is there a change in running sum syntax with the 4.1 upgrade?