Previous/Lag Function Not Working


I have 2 line item and on the other line item I used a Previous() function to try and get the last actuals value to spread it in forecast but it seems to not work, I also tried LAG() and same issue. What could possibly be the issue or is there a workaround on this please?

Below is the module, it is dimensioned by 2 list and Time.

Your input will be helpful, thanks.