Please check the formula of Forecast Period? line item in the SYS00 Time settings Module. The formula should be written in such a way that the boolean is checked for all the forecast months Also make sure you have set the Current Period correctly in the time settings. You can find the Time settings on the top left in Model Settings panel.
By using the formula - 'SYS00 Time Settings'.Forecast Period? you are pulling the Yearly data of 'Forecast Period?' line item. Why Yearly ? It's because the SYS01 Module is Time dimensioned and the Time Scale is set to Year. That is why if the summary was set to None in the earlier case, your booleans for the summary items(FY) were all blank. After setting it to 'Any' the booleans of FY in your SYS00 Module got checked in case any of the months of that particular year is 'True'.