Have a module with assets and time dimension, some of the assets starts from the middle of the year. when on selection of total assets, The "No of payments" lineitem not showing sequential numbers and anaplan is not accepting(ss for the same) the "formula" summary . Below is the formula for No of Payments = IF INPERIOD(Lease Input Module.Lease start date) THEN 1 ELSE PREVIOUS('No. of Payments' + 1) . Note - in period start is nothing but the start date of the asset.