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Automatic Business Partner Merging 
You can use BAPIs or BOR methods to automate individual steps of business partner merging. For further information on this, see the SAP note 624341 (Merging Business Partners).
You can use the following BAPIs for automatic business partner merging:
BAPI |
Description |
BAPI_ISUACCOUNT_GETDETAIL |
Display contract account |
BAPI_ISUACCOUNT_CHANGE |
Change contract account |
BAPI_ISUPARTNER_GETDETAIL |
Display contract account |
BAPI_ISUPARTNER_CHANGE |
Change contract account |
BAPI_ISUPROP_GETDETAIL |
Detailed information on owner allocation |
BAPI_ISUPROP_CREATEFROMDATA |
Create owner allocation |
BAPI_ISUPROP_CHANGE |
Change owner allocation |
BAPI_CTRACDOCUMENT_TRANSFER |
Transfer open FI-CA items |
BAPI_CTRACCONTRACTACCOUNT_GD1 |
Read detailed FI-CA contract account data |
BAPI_CTRACCONTRACTACCOUNT_CH1 |
Change FI-CA contract account |

Use mostly IS-U BAPIs to change master data in SAP utilities since these function modules contain additional fields for interfaces.

SAP does not recommend that you use the batch input procedure to automate steps. For further information on this, see the SAP note 432178 (IS-U Transactions and Batch Input).
Requirements for automating the business partner merging have been included. If you require any support, contact SAP.
