Rule library
UAD1468FatalField 4.110N/A

Provide the data source identifier (e.g., MLS number).

Where this rule lives in the report

Other
Data Source

Report Section as the GSEs define them — the black tab and grey bar you already read on the URAR.

Severity
Fatal — this blocks your UCDP submission and must be fixed before delivery.
Triggered when
DataSourceIdentifier is not provided in a given instance of DATA_SOURCE with DataSourceType = "MLS" that has arc role to PROPERTY container with @ValuationUseType <> ("SubjectProperty" or "PropertyAnalyzedNotUsed")
Data Point Name
DataSourceIdentifier
Unique ID
1800.0347
Report Field ID
4.110
What this field means
A unique alphanumeric string identifying the record as assigned by the Data Source Type.

Seen in the sample reports

How this field is populated in the official UAD 3.6 sample scenarios.

More rules in “Other”