Solution : https://service.sap.com/sap/support/notes/1030138 (SAP Service marketplace login required)
Key words : 
setenv oracle_home /oracle/client/10x_64/instantclient     reason, solaris x86_64 inan existing sap system, oracle database server running, 64-bit abap application server, sap standard installation packages, oracle client cd, 64-bit abap applicationserver, oracle_home varialbe set, abap application server, sap service marketplace
Related Notes : 
       
| 969519 | 6.20/6.40 Patch Collection Installation : Oracle/UNIX | 
| 908334 | |
| 785925 | SAP Web AS 6.40 SR1 ABAP Installation on UNIX | 
| 785921 | SAP Web AS 6.40 SR1 Installation on UNIX: Oracle | 
| 407314 | SAP kernel 6/7.x ORACLE: Released operating systems |