Solution : https://service.sap.com/sap/support/notes/315873 (SAP Service marketplace login required)
Key words :
user exit exit_saplmdr1_003' 'y' 'customer-specific method, user exit exit_saplmdr1_003' 'z' 'customer-specific method, user exit exit_saplmdr1_003' save, 'x' 'customer-specific method, additional key words mdr10001, user exit exit_saplmdr1_003, customer-specific rounding, deliver additional rounding, missing maintenance options, static rounding profiles
Related Notes :
| 303613 | Missing documentation on enhancement MDR10001 |