Hi, assuming that your Actual scenario setup is YTD and Forecast is periodic, you will typically have to adjust the rules to cater for the difference. I.e. CTA and historical translations (and possibly more) work differently on periodic data. So you will have to dig into this a lot deeper (especially on a flow member level), analyze the numbers in detail, track down the rules used to calculate the numbers, adjust, test and verify.
That is often work that the implementation partner does as part of the implementation of a solution as not all customers have the expertise in-house to adjust the rules in a viable way.
