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mathematical-discrepancy

HTTP 422 · Tenant fixable.

ERPly Pro validates the document maths before submitting it to DGII to reduce production rejections. This error means the sums do not add up.

Validated rules​

For each line:

lineTotal == round(qty * unitPrice, 2)
itbisLine == round(lineTotal * itbisRate / 100, 2)

For the document:

subtotal == sum(lineTotal)
itbisTotal == sum(itbisLine)
total == subtotal + itbisTotal

How to fix​

  • Round every calculation to 2 decimals using banker's rounding (ROUND_HALF_EVEN) or half-up — both are accepted, but must be consistent.
  • If your ERP uses more decimals internally, round to the field that is sent, not afterwards.
  • If DGII still rejects with code 17 or 18, the document has a real discrepancy between line quantities and declared totals.