BR-03: Missing IssueDate
BR-03 means the invoice issue date is missing or empty. The date should identify when the invoice was issued.
UBL location
/Invoice/cbc:IssueDate
Expected format
Use ISO 8601 date format: YYYY-MM-DD, for example 2026-09-08.
RejectFix checks the field and format. It does not choose a business date for you.