Solution : https://service.sap.com/sap/support/notes/536249 (SAP Service marketplace login required)
Key words :
length field label short 10 zgp lead medium 15 sap bp leading long 20 sap bp, leading heading 9 zgp lead, additional flag sap bp leading, choose 'environment' -> 'maintenance objects' -> 'generate', bpum_ctl-zgp_lead set flag 'optional', set flag 'sap bp, setting flag 'sap bp, tab page 'field label', select option 'generated objects', select program id r3tr
Related Notes :
| 517102 | BP_ADU: Composite SAP note time-dependent address usages |