The date range that you are trying to use cannot be placed in a variable. Variables can only have one piece of data for the range.

You will need to create a formula for the date ranges you want on your report.

I have created a similar report using a formula and no errors were found. Here is an example of the formula:

if {AR61A Historical Customer Transactions.Document date} in Date (2000,03,01) to Date (2001,02,28)
then {AR61A Historical Customer Transactions.Original amount} else 0;

if {AR61A Historical Customer Transactions.Document date} in Date (1999,03,01) to Date (2000,02,29)
then {AR61A Historical Customer Transactions.Original amount} else 0