Solution : https://service.sap.com/sap/support/notes/829174 (SAP Service marketplace login required)
Key words : 
erp stack #    hr-sp #            ea-hr #            avail, commentsea-hr sp 08     hr-sp 08, 4ea-hr sp 12     hr-sp 12, 7ea-hr sp 15     hr-sp 15, 17ea-hr sp 25     hr-sp 25, -ea-hr sp 09     hr-sp 09, -ea-hr sp 10     hr-sp 10, -ea-hr sp 11     hr-sp 11, -ea-hr sp 13     hr-sp 13, -ea-hr sp 14     hr-sp 14
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