instructure/canvas-lms · error · ImportError

Cannot set date override on non-existent term

Error message

Cannot set date override on non-existent term

What it means

Guard in SIS::TermImporter::Work#add_term: a date_override_enrollment_type was supplied for a term that is new (doesn't exist yet), so ImportError is raised — date overrides can only be set on existing terms.

Solutions

1. Create the term first (without override) in an earlier batch, then update it with the override
2. Remove the override columns from rows that create new terms

When it happens

Trigger: Thrown at lib/sis/term_importer.rb:56 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of instructure/canvas-lms@1c9f0bb801 (2026-09-15). Data as JSON: /api/errors/9e173944dffae244. Report an issue: GitHub.

Appendix: source

Thrown at lib/sis/term_importer.rb:56

      def initialize(batch, root_account, logger)
        @batch = batch
        @root_account = root_account
        @roll_back_data = []
        @logger = logger
        @success_count = 0
      end

      def add_term(term_id, name, status, start_date = nil, end_date = nil, integration_id = nil, date_override_enrollment_type = nil)
        raise ImportError, "No term_id given for a term" if term_id.blank?
        raise ImportError, "Improper status \"#{status}\" for term #{term_id}" unless /\Aactive|\Adeleted/i.match?(status)
        return if @batch.skip_deletes? && status =~ /deleted/i

        term = @root_account.enrollment_terms.where(sis_source_id: term_id).first_or_initialize
        term.sis_batch_id = @batch.id

        if date_override_enrollment_type
          # only configure the date override if this row is present
          raise ImportError, "Cannot set date override on non-existent term" if term.new_record?
          unless %w[StudentEnrollment TeacherEnrollment TaEnrollment DesignerEnrollment].include?(date_override_enrollment_type)
            raise ImportError, "Invalid date_override_enrollment_type"
          end

          date_override = term.enrollment_dates_overrides.where(enrollment_type: date_override_enrollment_type).order(:id).first
          unless date_override&.stuck_sis_fields&.intersect?(%i[start_at end_at])
            case status
            when /active/i
              date_override ||= term.enrollment_dates_overrides.build(context: @root_account, enrollment_type: date_override_enrollment_type)
              date_override.update!(start_at: start_date, end_at: end_date)
            when /deleted/i
              term.enrollment_dates_overrides.where(enrollment_type: date_override_enrollment_type).destroy_all
            end
          end
        else
          raise ImportError, "No name given for term #{term_id}" if name.blank?

          # only update the name on new records, and ones that haven't been

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