Solution : https://service.sap.com/sap/support/notes/92701 (SAP Service marketplace login required)
Key words : 
time-based revenue recognition case, fields tfpla-anztm andtfpla-anztj, prerequisites program error solution 1, add changing-parameter c_tfpla, reference field tfpla, additional key words, -swsd-bil-rr, function   call 'exit_saplogrr_402', billing plan lines, optional parameter
Related Notes : 
       
| 91747 | Determined monthly contribution is incorrect | 
| 80069 | Pricing in billing plan: Monthly amount incorrect |