Finite sum Code writing

Hi,
I want to input a formula which has finite summation in it, and also top boundry is an endogenous variable of the model, somthing like the picture attached

That is the type of non-stationary model that Dynare cannot handle. Depending on the value of n_t the length of the sum would change in each period.

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Thank you so much for the answer, then i’ll have to modify the equation’s or trick it somehow, appreciate your remark