Experiment 4

Experiment 4 – Advanced Validation & Hybrid Corrections

This experiment introduces a more rigorous correction algorithm, combining rule-based logic with ABN validation and extended GST checks to ensure compliance with Australian standards.

Enhanced Correction Algorithm

• Includes ABN format validation (strict 11-digit structure)
• Extended GST correction logic with rounding to 2 decimals
• Integration of corrections across amount_total, GST, and ABN consistency

Mathematical Principles:
  • ABN Validation: ABN ∈ {d₁d₂...d₁₁ | dᵢ ∈ [0,9]}
  • Acceptable GST Rates: rate ∈ {0.0, 0.1}
  • Amount Correction: amount_total = round(amount_excl_tax + gst, 2)
  • GST Auto-correction: gst_corrected = round(amount_excl_tax × 0.1, 2)
Validation Criteria:
  • Strict ABN format verification (11 digits)
  • Precision to 2 decimal places
  • Compliance with AU tax rates (0% or 10%)
  • Automatic correction of calculation errors
Result Verification Procedure

Recommended checks for corrected documents:

  1. ABN Validation: Confirm ABNs against ABR registry
  2. GST Audit: Ensure correct rate (0% or 10%) applied
  3. Arithmetic Check: Recalculate totals manually where needed
  4. Document Flow: Cross-check corrected values with original supplier documents
Data Input

• Receipts analysed: 6 with problems (from Experiment 2)
• Status: 5 with errors, 6 with warnings, 0 valid

Controls: