Solution : https://service.sap.com/sap/support/notes/199967 (SAP Service marketplace login required)
Key words :
import parameter reference field reference type proposal optionali_bldat bkpf-bldat sy-datlo xi_budat bkpf-budat sy-datlo xi_cpudt bkpf-cpudtx 3, additional key words fb01, parameter 'i_cpudt', import interface, function module 'fi_change_payment_conditions', manually implemented note 140507, transaction se37 add, payment key designates, original entry date, payment key
Related Notes :
| 195440 | FB01: Payment deadline baseline date in wrong year |
| 187817 | FB01: incorrect baseline date for paymnt determined |
| 140507 | FB01:Chang.pymt term does not aff.cash discnt line |