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I have a model in which there is a function on the right hand side. Obviously, the left hand side is an endogenous variable and the right hand side is a function of another endogenous variable (the function is @cumsum). Model is solvable, but the value of function on the right hand side does not change in the baselin (ie it calculates off the actual historical data rather than the baseline). Does this mean that such functions cannot be used in models?

Any help appreciated.

Yep, that sums it up quite well.