Hi Bharath Raghupathi-Oracle, The option "by" you used on RSUM does not appear on function syntax (RSUM(expr)), but it worked fine. Thanks so much for your help.

Hi Raghavan p-Oracle, My point is different. My question is related to cumulative amounts over time. It means that a period have to show its own amount plus every previous period amounts. The question you've mentioned lists periods with its specific amount. Thanks