The BatchEstimatorInv resource has a Propagator field containing the name of the Propagator resource that will be used during the estimation process. The ErrorControl parameter specified for the ForceModel resource associated with this propagator must be 'None.'
If other than 'None,' generate an error. (not just a warning).
Proposed Error Message: (SPH will review)
GMAT navigation requires use of fixed stepped propagation. The ErrorControl parameter specified for the ForceModel resource associated with the BatchEstimatorInv Propagator must be 'None.' Of course, when using fixed step control, the user must choose a step size, as given by the Propagator InitialStepSize field, for the chosen orbit regime and force profile, that yields the desired accuracy.