Input validation

In ABAP the rules sit in ABAP Dictionary, on domains, data elements and check tables, and the screen applies them. Code that takes data in without a screen calls a check of its own, by type in abap-data-validator or against fixed values in abapDomCheck.

Overview

SAP SHIPS

On a classic dynpro, fields that refer to ABAP Dictionary are checked before PAI runs: a value must exist in its check table and be one of its domain's fixed values. In RAP, a validation declared in the behavior definition runs in the save sequence and can reject an instance, with its check written in the behavior pool.

Not covered: At the screen. Data that reaches the system through an upload, an RFC call or a program passes no dictionary check, and a RAP validation checks only what its author implemented.

SourceABAP Keyword Documentation 7.52 — Dynpros, Automatic Input Checkschecked 2026-09-14