Rule library
UAD1432FatalField 21.007Sales Comparable

Comparable # must be unique. For assistance with this message, contact the appraisal software vendor.

Where this rule lives in the report

Sales Comparison Approach; Prior Sale and Transfer History
Comparable
General Information; Comparable Transfer History

Report Section and Report Subsection 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
PropertyOrdinalNumber is not unique across all instances of PROPERTY with @ValuationUseType = "SalesComparable"
Data Point Name
PropertyOrdinalNumber
Unique ID
1800.0192
Report Field ID
21.007
What this field means
A positive, whole number that identifies the position of the property in the valuation analysis.

Seen in the sample reports

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

More rules in “Sales Comparison Approach; Prior Sale and Transfer History”