The ‘Dt Data Changes’ field contains three letter field codes of those fields that address matching has changes from source data to result data. For example, if the street name was mis-spelt and had been changed, the code THN would appear in the ‘Dt Data Changes’ field.
Only certain parts of the result data are checked for changes. These are:
| Data Changes Codes | Australian | New Zealand |
| PCD Postcode | ✔ | |
| LOC Locality | ✔ | |
| SUB Suburb/Lobby/RD0 | ✔ | |
| STT State | ✔ | |
| CTY Town/City/Mailtown | ✔ | |
| THN Street name | ✔ | ✔ |
| THT Street type eg. ST, RD | ✔ | ✔ |
| TTS Street type suffix eg. N, S, E, W | ✔ | |
| TN1 Street Number 1 | ✔ | |
| TN1 Street Number 2 | ✔ | |
| PDT Postal delivery type eg. PO Box | ✔ | |
| PDP Post Box Number Prefix | ✔ | |
| PDS Post Box Number Suffix | ✔ | |
| BOR Matched to alternative locality | ✔ | |
| ATN Matched to alternative street name | ✔ | |
| FUT Flat/Unit Type | ✔ | |
| GID Match that could only be made to the group or street level and issued a group DID | ✔ | |
| LID Match that could only be made to the locality level and issued a group DID | ✔ | |