Go to the Report -> Volume integral -> sum -> Discrete Phase Model, then calculate the sum for:
DPM mass source
DPM enthalpy source
the DPM mass source sum should be algebraically equal to the mass imbalance in the Report->flux panel
the DPM enthalpy source sum should be algebraically equal to the energy imbalance in the Report->flux panel
Of course, this happens at convergence. For large combustion problems, this energy balance can take longer to achieve and is a better indication of convergence than only relying on residuals.