Solution : https://service.sap.com/sap/support/notes/1542906 (SAP Service marketplace login required)
Key words :
table includes guid information, external tax system 'exit_saplfytx_user_001', external tax system, user-exit 'exit_saplfytx_user_001', function module 'bbp_calculate_tax_item46b', internal table ct_item, memory id 'srm_external_tax', srm purchase order, purchase order, tax amount
Related Notes :
| 1039435 | FAQ: Trigger of tax update |
| 986148 | MIRO: Document data missing in EXIT_SAPLFYTX_USER_001 |