1.5 · Update Meter Balance

18.3a · Where the target SMETS1 ESME or SMETS1 GSME does not support Adjust Meter Balance when Payment Mode is Credit Mode and the Device is in Credit Mode (with their SMETS meanings), the S1SP shall return a SMETS1 Response indicating failure.

18.3b · Where the target SMETS1 ESME or SMETS1 GSME has no function to ResetMeterBalance (with its DUIS meaning) in Credit Mode and the Payment Mode (with its SMETS1 meaning) is Credit and the Service Request specifies a ResetMeterBalance (with its DUIS meaning) the S1SP shall create a SMETS1 Response indicating failure.

18.3c · Where the target SMETS1 ESME or SMETS1 GSME may apply Payment based Debt Recovery (with its SMETS1 meaning) when a positive adjustment is made to the Meter Balance, the increase in the Meter Balance resulting from this Service Request may be correspondingly less than the adjustment specified.

18.3d · Where the target SMETS1 ESME or SMETS1 GSME does not support negative adjustments to the ESME Meter Balance/ GSME PrepaymentMode Meter Balance (with their DUIS and SMETS1 meanings) if the result of applying those adjustments would have been either to change the Meter Balance from a negative value to a more negative value or from a non-negative value to a negative value, then the S1SP shall create a SMETS1 Response indicating failure should such a Service Request be received.

18.3e · Where the target SMETS1 ESME or SMETS1 GSME processes a positive adjustment to the GSME PrepaymentMode Meter Balance (with their DUIS and SMETS1 meanings) then the Device will, in addition to adjusting the Meter Balance (with its SMETS1 meaning), first apply that adjustment to the Accumulated Debt Register if it is greater than zero, second, if the accumulated Debt Register is zero, or is reduced to zero, apply any remaining adjustment to the Emergency Credit Balance until it reaches the Emergency Credit Limit.

18.3f · Where the SMETS1 GSME does not support the setting of Meter Balance (with its SMETS1 meaning) to greater than £20,000 then the S1SP shall, where it receives a Service Request that would result in a Meter Balance of greater than £20,000, return a SMETS1 Response indicating failure.

18.3g · The target SMETS1 ESME and SMETS1 GSME applies the adjustment in the following order: (i) recovery of Payment-based Debt of an amount defined by Debt Recovery per Payment from the Payment Debt Register subject to the Debt Recovery Rate Cap; (ii) recovery of debt accumulated in the Accumulated Debt Register; (iii) increasing the meter balance until it reaches the non-disablement threshold; (iv) repayment of Emergency Credit activated and used by Consumer; and (v) adding remaining credit (the credit after deduction of i, ii, iii and iv above) to the Meter Balance.

18.3h · Where the target SMETS1 ESME does not support a zero value for AdjustMeterValue (with its DUIS meaning) then where such a Service Request is received, the S1SP shall create a SMETS1 Response indicating failure.