Complete replacement for the payable line items. To preserve a line returned by GET /v1/payables/{id}, map financial.grossAmount.amount to grossAmount, expenseAccount.id to expenseAccountId, vatAccount.id or reverseChargeAccount.id to taxAccountId, costCenterId directly, and analyticalProperties fieldId/valueId pairs to analyticalFieldValues; use null only when an account or cost center should remain unassigned. A null taxAccountId is not a tax-exempt, zero-rated, or reverse-charge treatment; changing tax treatment requires the matching company tax account ID. Gross amounts must sum to the payable amount. Tax amounts are recalculated from taxAccountId, clearing manual VAT adjustments.

Prepaid-expense amortisation period to apply to the Payable.