This guide describes the various reasons why a Data Aggregator can reject a D0209 (‘Instruction(s) to Non Half Hourly or Half Hourly Data Aggregator’) or D0019 ('Metering System EAC/AA Data’) flow and to identify the responsibility for resolution and method of correction in each case.

<div data-id="1-1.1" style="margin-left: 2em">1.1 What is a Failed Instruction?</div>

<div data-id="1-1.2" style="margin-left: 2em">1.2 Content of this guidance note</div>

<div data-id="1" style="text-align:left">1 - Introduction</div>

<div data-id="2-2.1" style="margin-left: 2em">2.1 What are the timescales for resolving Failed Instructions?</div>

<div data-id="2-2.2" style="margin-left: 2em">2.2 Validation by the <u class='defined-term'>Data Aggregator</u></div>

<div data-id="2-2.3" style="margin-left: 2em">2.3 How do D0023 Failed Instructions relate to D0095 and D0235 exceptions?</div>

<div data-id="2-2.4" style="margin-left: 2em">2.4 What information does a D0023 contain?</div>

<div data-id="2-2.5" style="margin-left: 2em">2.5 Standing Data Errors</div>

<div data-id="2-2.6" style="margin-left: 2em">2.6 Instruction Collation Exceptions</div>

<div data-id="2-2.7" style="margin-left: 2em">2.7 Consequential Failures</div>

<div data-id="2-2.8" style="margin-left: 2em">2.8 Changes after the Final Reconciliation Run</div>

<div data-id="2" style="text-align:left">2 – Resolving Failed Instructions</div>

<div data-id="3-3.1" style="margin-left: 2em">3.1 N2_ Invalid records before Significant Date</div>

<div data-id="3-3.2" style="margin-left: 2em">3.2 NA_ Attribute values after Registration end</div>

<div data-id="3-3.3" style="margin-left: 2em">3.3 NC_ Invalid Change</div>

<div data-id="3-3.4" style="margin-left: 2em">3.4 ND_ Duplicate Start Date</div>

<div data-id="3-3.5" style="margin-left: 2em">3.5 NE_ Early Start/End Date</div>

<div data-id="3-3.6" style="margin-left: 2em">3.6 NF_ Missing attributes in first set of consumption data</div>

<div data-id="3-3.7" style="margin-left: 2em">3.7 NI_ Invalid <u class='defined-term'>Identifier</u></div>

<div data-id="3-3.8" style="margin-left: 2em">3.8 NM_ Missing From Database</div>

<div data-id="3-3.9" style="margin-left: 2em">3.9 NN_ No overlap with <u class='defined-term'>Data Aggregator</u> Appointment</div>

<div data-id="3-3.10" style="margin-left: 2em">3.10 NO_ Overlap</div>

<div data-id="3-3.11" style="margin-left: 2em">3.11 NR_ Attribute value for a Registration which does not exist</div>

<div data-id="3-3.12" style="margin-left: 2em">3.12 NS_ Missing attribute value at start of Registration or <u class='defined-term'>Data Aggregator</u> Appointment</div>

<div data-id="3-3.13" style="margin-left: 2em">3.13 NT_ Missing or duplicated <u class='defined-term'>Time Pattern Regime</u> records</div>

<div data-id="3-3.14" style="margin-left: 2em">3.14 NU_ Invalid <u class='defined-term'>Time Pattern Regime</u></div>

<div data-id="3-3.15" style="margin-left: 2em">3.15 NV_ Invalid Standing Data</div>

<div data-id="3-3.16" style="margin-left: 2em">3.16 NX_ End Date before Start Date</div>

<div data-id="3-3.17" style="margin-left: 2em">3.17 NZ_ Instruction does not contain data already on the database</div>

<div data-id="3-3.18" style="margin-left: 2em">3.18 N0_/N9_ Miscellaneous</div>

<div data-id="3" style="text-align:left">3 – Non-Half Hourly Instruction Failure Reason <u class='defined-term'>Code</u>s</div>

<div data-id="4" style="text-align:left">4 – Half Hourly Instruction Failure Reason <u class='defined-term'>Code</u>s</div>

CONTENTS

D0023 Resolving Failed Instructions V1.0

Defined Terms

Cross-references