ABAP Developmentintermediate

Watchpoints, Layers and ATC

Advanced techniques for hard-to-catch bugs.

Explanation

Watchpoints break when a specified variable changes value — invaluable when data is corrupted somewhere unknown. Layer-aware debugging lets you step over framework code and focus on business logic. ATC (ABAP Test Cockpit) is not a debugger but often catches issues before they reach runtime.

Code example

ABAP Code

" Set condition on watchpoint in New Debugger UI" e.g. lv_amount > 1000

Real project scenario

A wrong tax rate appeared only on Fridays. A conditional watchpoint on the rate field caught the wrong function-module call the first time.

Common mistakes

Setting watchpoints on structures instead of specific fields; running debugger without disabling authorisation checks — traces get muddled.

Best practices

Reproduce → simplify → watchpoint the smallest failing value; complement debugger with ST22 stack traces and ST05 for DB context.

Interview angle

How do you analyse a short dump without reproducing it?