Managed to resolve it...
The solution lies in installation of EAPPWEB first followed by installation of siebel enterprise ! !
I am also facing same issue while i run the installer in silent mode using response file.
I tried installing EAPPWEB first and seeing same error .SEVERE:OUI-10091:There are no patches that need to be applied from the patchset Siebel Eappweb PatchSet 188.8.131.52.0
DO you know wht could be the issue?
Thanks in advance