Rule library
UAD1171FatalField 1.047Subject

The unit identifier must be unique.

Where this rule lives in the report

Unit Interior
{No Label}

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
UnitIdentifier is not unique across all instances of PROPERTY_UNIT_DETAIL
Data Point Name
UnitIdentifier
Unique ID
0700.0114
Report Field ID
1.047
What this field means
An unique alphanumeric string used to identify and/or differentiate between multiple units located on the property.

Seen in the sample reports

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

Primary DwellingSubject
Unit 1Subject

More rules in “Unit Interior”