2.2 · Top Up Device

18.6a · The target SMETS1 ESME and SMETS1 GSME applies the credit added 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.

18.6b · Where the target SMETS1 ESME or SMETS1 GSME only supports UTRN values (with its DUIS meaning) that represent positive integer multiples of 100, then the S1SP shall, where the Command Variant is 2 or 3, return a SMETS1 Alert indicating failure, unless the UTRN value provided represents a positive integer multiple of 100. For clarity, DUIS states in section 1.4.7.5 that “For SMETS1 Service Requests with a Command Variant value of 2 or 3, the UTRN data item shall contain a 20 digit string (each digit taking a value of 0-9) representing value in pence, using leading zeros as necessary to give a 20 digit length.”