What is the "KNA1 direct access" issue in S/4HANA migration?

KNA1 (Customer master) direct access. S/4HANA uses Business Partner model — KNA1 is still present but populated via BP. Use released CDS view I_Customer. Direct KNA1 writes are blocked in S/4HANA.

How much effort does it take to fix "KNA1 direct access"?

Remediation effort is rated M — Medium (days). Severity: HIGH.

Which tool checks for KNA1 direct access automatically?

The s4ready.ai A1 Readiness Scanner checks for KNA1 direct access (and 29 other rules) automatically across your custom ABAP codebase. Results include object-level findings with severity and effort estimates.

HIGH Effort: M — Medium (days) Deprecated Tables

How to remediate: KNA1 direct access

KNA1 (Customer master) direct access. S/4HANA uses Business Partner model — KNA1 is still present but populated via BP.

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What changes in S/4HANA

Use released CDS view I_Customer. Direct KNA1 writes are blocked in S/4HANA.

Before and after: ABAP code example

Before (ECC)

* ECC: KNA1 direct write — blocked in S/4HANA
MODIFY kna1 FROM ls_customer.
IF sy-subrc <> 0.
  MESSAGE e001(z_cust).
ENDIF.

After (S/4HANA)

* S/4HANA: Business Partner API — use BUPA FM or RAP BO
CALL FUNCTION 'BAPI_BUPA_CENTRAL_CHANGE'
  EXPORTING
    businesspartner  = lv_bpnr
    centraldata      = ls_central
  IMPORTING
    return           = lt_return.
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
  EXPORTING wait = abap_true.

Effort estimate and common pitfalls

Effort estimate

M — Medium (days)

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

! Missing related objects that contain the same pattern
! Not testing edge cases after replacing the API
! Skipping regression tests for dependent programs

Related rules to check

CRITICAL XL

BSEG direct access

BSEG is a cluster table in ECC. In S/4HANA, financial data moved to ACDOCA (Universal Journal).

HIGH M

LFA1 direct access

LFA1 (Vendor master) direct access. S/4HANA uses Business Partner model for vendors.

HIGH L

Deprecated customer BAPIs

BAPI_CUSTOMER_* function modules are deprecated. Use Business Partner APIs in S/4HANA.

Find every instance of this issue in your codebase

The A1 scanner checks all 30 compatibility rules — including KNA1 direct access — across your custom ABAP objects and produces a prioritised remediation backlog.

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← All remediation rules Resources →

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