In order to make a full accumulation in the script first you need to order the table by the date, after that you can use de peek function, this function returns the previous record read of a field, so the script should be something like this:
Or else create one more expression with Sum(Amount) and then try to put that expression on the left of down Accumulation and please choose the Full accumulation then you will get as per your requirement.
Please close this thread so that Freshers can easily understood?
Life is so rich, and we need to respect to the life !!!