Solution : https://service.sap.com/sap/support/notes/110018 (SAP Service marketplace login required)
Key words : 
/43h    modified scheme tstx - cycle ttsh included, wage type /43h   - techical equivalent, wage type m980   - monthly amount, cycle ttsh       - read m980, toenter wage type m990, prerequisites law 127/1998 increased amount, text   kvfbt        2 120         2 900       zp-úleva 77%, directory/specific/czsk/note_0110018, deductablefrom monthly tax base, extract transport csfk901266and import
Related Notes : 
       
| 88672 | HR Country version 3.1H for Czech Republic | 
| 72104 | HR Country version 3.0F for Czech Republic |