1.1 What is a Failed Instruction?

1.2 Content of this guidance note

2.1 What are the timescales for resolving Failed Instructions?

2.2 Validation by the Data Aggregator

2.3 How do D0023 Failed Instructions relate to D0095 and D0235 exceptions?

2.4 What information does a D0023 contain?

2.5 Standing Data Errors

2.6 Instruction Collation Exceptions

2.7 Consequential Failures

2.8 Changes after the Final Reconciliation Run

3.1 N2_ Invalid records before Significant Date

3.2 NA_ Attribute values after Registration end

3.3 NC_ Invalid Change

3.4 ND_ Duplicate Start Date

3.5 NE_ Early Start/End Date

3.6 NF_ Missing attributes in first set of consumption data

3.7 NI_ Invalid Identifier

3.8 NM_ Missing From Database

3.9 NN_ No overlap with Data Aggregator Appointment

3.10 NO_ Overlap

3.11 NR_ Attribute value for a Registration which does not exist

3.12 NS_ Missing attribute value at start of Registration or Data Aggregator Appointment

3.13 NT_ Missing or duplicated Time Pattern Regime records

3.14 NU_ Invalid Time Pattern Regime

3.15 NV_ Invalid Standing Data

3.16 NX_ End Date before Start Date

3.17 NZ_ Instruction does not contain data already on the database

3.18 N0_/N9_ Miscellaneous