This warning most commonly occurs in a base year or a year before the FirstSimulationYear. It occurs when the data you entered for Historical Production exceeds the amount that could possibly be dispatched based on the data you entered for the Exogenous and Endogenous Capacity variables and the Maximum Availability variable. Check the data you entered for all of these variables, particularly in the Current Accounts data set and pay special attention to the scaling factors and units used to specify the data.