What is the "Unchecked SY-SUBRC" issue in S/4HANA migration?

Database operations or function module calls without checking SY-SUBRC return code. Silent failures cause data inconsistency. S/4HANA introduces new error conditions that ECC never raised.

How much effort does it take to fix "Unchecked SY-SUBRC"?

Remediation effort is rated S — Small (hours). Severity: MEDIUM.

Which tool checks for Unchecked SY-SUBRC automatically?

The s4ready.ai A1 Readiness Scanner checks for Unchecked SY-SUBRC (and 29 other rules) automatically across your custom ABAP codebase. Results include object-level findings with severity and effort estimates.

MEDIUM Effort: S — Small (hours) Error Handling

How to remediate: Unchecked SY-SUBRC

Database operations or function module calls without checking SY-SUBRC return code.

Is this issue in your codebase?

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What changes in S/4HANA

Silent failures cause data inconsistency. S/4HANA introduces new error conditions that ECC never raised.

Before and after: ABAP code example

Before (ECC)

* ECC: no SY-SUBRC check — silent failure
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
  EXPORTING input  = lv_raw
  IMPORTING output = lv_formatted.
" continue processing with potentially empty lv_formatted

After (S/4HANA)

* S/4HANA: always check return code
CALL FUNCTION 'CONVERSION_EXIT_ALPHA_INPUT'
  EXPORTING input  = lv_raw
  IMPORTING output = lv_formatted
  EXCEPTIONS others = 4.
IF sy-subrc <> 0.
  RAISE EXCEPTION TYPE cx_sy_conversion_error
    MESSAGE 'Alpha conversion failed for input'(001).
ENDIF.

Effort estimate and common pitfalls

Effort estimate

S — Small (hours)

Estimate is per affected object. Total effort scales with the number of occurrences in your codebase. Use the A1 scan to get an object-level count before estimating the full project.

Common pitfalls

! Forgetting to update all occurrences in the same program
! Not running ATC after the change to confirm the finding is resolved

Related rules to check

HIGH M

Missing AUTHORITY-CHECK

Programs reading/writing sensitive data without AUTHORITY-CHECK statements.

HIGH S

Missing FOR ALL ENTRIES guard

FOR ALL ENTRIES IN without an initial-table check returns the full table when the driver table is empty.

MEDIUM S

Obsolete ABAP statements

Use of obsolete ABAP syntax: MOVE, COMPUTE, WRITE TO, SORT BY ASCENDING/DESCENDING without field list.

Find every instance of this issue in your codebase

The A1 scanner checks all 30 compatibility rules — including Unchecked SY-SUBRC — across your custom ABAP objects and produces a prioritised remediation backlog.

Scan your codebase for this issue free →

← All remediation rules Resources →

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