Solution : https://service.sap.com/sap/support/notes/1578789 (SAP Service marketplace login required)
Key words : 
social insurance contribution models, source code correction instructions, prerequisites release support package 4, /3 hr support package schedule, 6c hr sp g5 4, part-time contracts, sap service marketplace, 70 hr sp b0 5, support package, 00 hr sp 76 6
Related Notes : 
       
| 1354312 | ES28.11: TC: Bonific. not being correctly distributed for TP | 
| 1071282 | CONSULT: List of tags for Spain notes. | 
| 167718 | CONSULT.: HRMS España - Novedades |