https://userapps.support.sap.com/sap/support/knowledge/en/3168690
3168690 - BAPI_PO_CREATE1 or BAPI_PO_CHANGE dumps at statement FBGENMAC | SAP Knowledge Base Article
BAPI_PO_CREATE1 or BAPI_PO_CHANGE dumps at the test data generation statement FBGENMAC.