Solution : https://service.sap.com/sap/support/notes/697940 (SAP Service marketplace login required)
Key words : 
terms negative vacation accrual, vacation pay reason, excess vacation compared, attached source code, symptom negative liability, negative liability, accrued vacation, prerequisites employees, support package, eligibility
Related Notes : 
       
| 374466 | Q&A: Master Note for Vacation Pay - Canada. |