Solution : https://service.sap.com/sap/support/notes/358451 (SAP Service marketplace login required)
Key words :
importing parameter called is_cobra, applying hr support packages 29-37, user exit pben0008, sap standard calculation, standard calculation routine, additional key words, hr support package, function group hrben00general, respective lcp applicable, function module exit_saplhrben00general_008
Related Notes :
1304646 | Missing parameter for BAdI PBEN0008 |
394878 | Q&A: User exit PBEN0008 inactive after note 358451 |
321275 | Wrong COBRA costs after application of note 312046 |
312046 | Wrong benefit group/status used in calculations |