HIGH Effort: L — Large (1–2 weeks) Deprecated APIs

How to remediate: Deprecated customer BAPIs

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

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What changes in S/4HANA

Customer creation/change must go through Business Partner (BUPA) APIs.

Before and after: ABAP code example

Before (ECC) 
* ECC: deprecated customer BAPI
CALL FUNCTION 'BAPI_CUSTOMER_CREATEFROMDATA1'
  EXPORTING
    pi_kunnr          = lv_kunnr
    pi_personaldata   = ls_personal
  IMPORTING
    return            = lt_return.
After (S/4HANA) 
* S/4HANA: Business Partner central API
CALL FUNCTION 'BAPI_BUPA_CREATE_FROM_DATA'
  EXPORTING
    partnercategory = '1'
    centraldata     = ls_central
    addressdata     = ls_address
  IMPORTING
    businesspartner = lv_bpnr
    return          = lt_return.
CALL FUNCTION 'BAPI_TRANSACTION_COMMIT'
  EXPORTING wait = abap_true.

Effort estimate and common pitfalls

Effort estimate

L — Large (1–2 weeks)

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

  • ! Underestimating the number of affected objects
  • ! Missing performance test after switching to released APIs
  • ! Transport dependencies across development, quality, and production

Related rules to check

HIGH M

KNA1 direct access

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

Deprecated vendor BAPIs

BAPI_VENDOR_* function modules are deprecated. Use Business Partner APIs.
MEDIUM M

Obsolete function modules

Usage of function modules flagged as obsolete in SAP S/4HANA simplification list.

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