Upgrade R12.0.4 to R12.1.3 steps

The R12.1.3 can only be applied on top of R12.1.1 or R12.1.2.

So the PATH have to be : 12.0.4 => 12.1.1 => 12.1.3

Relevant notes to perform  upgrade :-

 1)Upgrade from R12.0.4 to R12.1.1.

Note 752619.1 Oracle E-Business Suite Release 12.1.1 Maintenance Pack Installation Instructions
NOTE:798258.1 - Oracle Applications Release Notes, Release 12.1.1

2)Upgrading from R12.1.1 to R12.1.3

Note 1080973.1 - Title: Oracle E-Business Suite Release 12.1.3 Readme
Note 1077769.1 - To Install The "Patch 9239089 R12.AD.B.Delta.3"Oracle Applications