Displaying Row numbers in a Business objects report

Steps to add Row number to business objects report:

1). Create a variable with the following formula:

=runningCount(any variable)

2). Add the Variable to the table as the first column.

Steps to reset the row numbers:

1). Add a second argument to the runningCount function:

=runningCount(any variable;reset variable)

when the value of the reset variable changes , the row count will reset to 0