Thanks Rob - I think I'm getting there. For id=B, the solutions status is failed and both the original code and the new code yield (a) negative values for interest and (b) violate the equation EodBalance[t] = EodBalance[t-1] + Interest[t] + deposit[t] (when I don't put in the MS option). In contrast, for id=A, the solution status is failed, but the results are consistent with the model (i.e. non-negative interest and EodBalance[t] = EodBalance[t-1] + Interest[t] + deposit[t]. Am I right in concluding that the difference is id=A generates a feasible (but failed solution) and id=B generates an infeasible (and also failed solution). That is, does "infeasible solution" mean it doesn't meet the parameters of the model (and thus, generates, for example, negative interest)? Thank you for your help, Rick
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