R12.2 PREPARE phase failed ERRORMSG Application of patch did not go through successfully

Issue:
=============================
Inside evalADPATCHStatus()...
=============================
message_status: ERROR
Application of patch did not go through successfully.
*******FATAL ERROR*******
PROGRAM : (/u11/home/apdba/fs2/EBSapps/appl/ad/12.0.0/patch/115/bin/txkADOPPreparePhaseSynchronize.pl)
TIME    : Sat Feb  6 05:13:21 2016
FUNCTION: main::execADPATCH [ Level 1 ]
ERRORMSG: Application of patch did not go through successfully.
Cause:
For some reason , even if we source PATCH fs, custom tops were pointing to RUN fs.
[apdba@apdba-blog ~]$ . .bash_profile
  E-Business Suite Environment Information
  ----------------------------------------
  RUN File System           : /u11/home/apdba/fs2/EBSapps/appl
  PATCH File System         : /u11/home/apdba/fs1/EBSapps/appl
  Non-Editioned File System : /u11/home/apdba/fs_ne
  DB Host: edd01db01-vip.apdba.com  Service/SID: apdba
  E-Business Suite Environment Setting
  ------------------------------------
  - Enter [R/r] for sourcing Run File System Environment file, or
  - Enter [P/p] for sourcing Patch File System Environment file, or
  - Enter anything else to exit
  Please choose the environment file you wish to source [R/P]:P
  Sourcing the PATCH File System ...
[apdba@apdba-blog ~]$
[apdba@apdba-blog ~]$
[apdba@apdba-blog ~]$ echo $BIO_TOP
/u11/home/apdba/fs2/EBSapps/appl/bio/12.0.0
[apdba@apdba-blog ~]$
Fix:
Source PATCH fs and run autoconfig.
PDHINT2 Status:
[apdba@apdba-blog ~]$ adop -status
Enter the APPS password:
==============================================================
ADOP (C.Delta.6)
Session Id: 20
Command: status
Output: /u11/home/apdba/fs_ne/EBSapps/log/status_20160206_063201/adzdshowstatus.out
===============================================================
Node Name       Node Type  Phase           Status          Started              Finished             Elapsed
--------------- ---------- --------------- --------------- -------------------- -------------------- ------------
apdba-blog    master     PREPARE         COMPLETED       2016/02/06 05:10:58  2016/02/06 06:27:21  1:16:23
                           APPLY           ACTIVE          2016/02/06 06:29:49  2016/02/06 06:31:05  0:01:16
                           FINALIZE        NOT STARTED
                           CUTOVER         NOT STARTED
                           CLEANUP         NOT STARTED

apdba-blog01    slave      PREPARE         COMPLETED       2016/02/06 05:12:34  2016/02/06 06:27:28  1:14:54
                           APPLY           ACTIVE          2016/02/06 06:31:22  2016/02/06 06:31:24  0:00:02
                           FINALIZE        NOT STARTED
                           CUTOVER         NOT STARTED
                           CLEANUP         NOT STARTED
File System Synchronization Type: Light
adop exiting with status = 0 (Success)