Solution : https://service.sap.com/sap/support/notes/333803 (SAP Service marketplace login required)
Key words :
additional key words billing index, billing due list, development class vmod, field vkdfs-sortkri, attached correction instruction, create routine userexit_vkdfs_sortkri_cc, billing indexes, intercompany billing, routine userexit_vkdfs_sortkri_cc, table vkdfs
Related Notes :
| 63523 | User exits for billing index as of Release 3.1G |
| 42307 | User exits for the billing index up to Rel. 3.0F |