Solution : https://service.sap.com/sap/support/notes/119780 (SAP Service marketplace login required)
Summary : 
      This SAP Note provides guidance on using a distributed HR system architecture within R/3 environments. It clarifies that the features and integration scenarios available depend on the smallest release version among participating systems. Key points include the central operation of HR, impossibility of operating independent HR systems with multiple AC/LO systems, and offered system combinations per release (from Release 3.1 to R/3 Enterprise Core 4.70). Each scenario supports specific integration and restricts others like HR: Payroll for the Construction Industry. Detailed IMG documentation and consultant support are recommended for non-standard architectures or extensive customization.
Key words : 
hr master data personnel cost planning transfer travel expense bills transfer payroll accounting transfer logistics confirmations, hr master data, hr planning data, replication hr organizational data, payroll construction industry', cost centers, additional key words, sap components integrated, legal change patches, separate hr systems
Related Notes : 
       
| 483255 | Remote cost center validation in IT0027, IT0015, IT0014 | 
| 389412 | RPCIPE00: Supply of several accounting systems | 
| 328048 | HR-EURO: HR client after local currency changeover | 
| 323700 | Transport of Customizing addresses between Releases,,,, | 
| 321522 | HR-CA-ALE: System copy and distribution of HRP1001 | 
| 302153 | Branches data in a distributed system | 
| 200066 | HR-CA-ALE: Q&A for setting up HR ALE scenarios | 
| 174069 | CATS: distributed systems | 
| 135041 | Separation LCPs HR / Hot Packages as of Rel. 4.5B | 
| 121614 | Q&A on posting of payr.acct.Rel.4.x-4.x in ALE scen. | 
| 86241 | Legal Change Patches / Support Packages for HR |