Source table: OPTR.

For the Italy localization only.

Navigation path 1: Administration → Setup → Financial → Tax → Withholding Tax, and go to the column Payment Reason Code.
Navigation path 2: Business Partner Master Data → Accounting → Tax, select the checkbox Subject to Withholding Tax, choose the browser button next to the Specific WTax Amounts Setup field, and go to the column Payment Reason Code.

PaymentReasonCodeService Members