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Using the model object, how would you place constraints on your endogenous variables forecast? For example, the endogenous variables are market shares of substitute goods. I want to insure that the summation of the endogenous variables equal one.

Please note the constraint does not necessarily need to be one. It could be another time series.

You can add the relationship as an identity. Please refer to EViews Users Guide II, Chapter 36, page 416 for more details...