OPATCH_JAVA_ERROR=CHECKCONFLICT: OPATCH CANNOT PROCESS OVERLAY PATCHES BECAUSE OF NO OUI SUPPORT. PLEASE TAKE LATEST OUI 10.1 PATCHSET FROM "MY ORACLE SUPPORT" AND TRY AGAIN.

[ebsmac@applusr 11710576]$ opatch apply

Oracle Interim Patch Installer version 1.0.0.0.64
Copyright (c) 2011 Oracle Corporation. All Rights Reserved..

Oracle recommends you to use the latest OPatch version
and read the OPatch documentation available in the OPatch/docs
directory for usage. For information about the latest OPatch and
other support-related issues, refer to document ID 293369.1
available on My Oracle Support (https://myoraclesupport.oracle.com)

Oracle Home           : /s001/apps/tech_st/10.1.2
Oracle Home Inventory : /apps1/apps/tech_st/10.1.2/inventory
Central Inventory     : /apps1/oraInventory
   from               : /etc/oraInst.loc
OUI location          : /apps1/apps/tech_st/10.1.2/oui
OUI shared library    : /apps1/apps/tech_st/10.1.2/oui/lib/linux/liboraInstaller.so
Java location         : /apps1/apps/tech_st/10.1.2/jre/1.4.2/bin/java
Log file location     : /s001/apps/tech_st/10.1.2/.patch_storage/<patch ID>/*.log

Creating log file "/s001/apps/tech_st/10.1.2/.patch_storage/11710576/Apply_11710576_03-10-2013_21-02-24.log"

Invoking fuser to check for active processes.

OPATCH_JAVA_ERROR=CheckConflict: OPatch cannot process overlay patches because of no OUI support. Please take latest OUI 10.1 patchset from "My Oracle Support" and try again.
Cannot check bug/file conflict and component prerequisite checks.

ERROR: OPatch failed during prerequisite check.
[ebsmac@m1tstap01 11710576]$


Solution :-

Apply below OUI patch

p6640838_10106_Linux-x86-64.zip    OUI CD PLACE HOLDER ON ARU FOR 10106

IMPORTANT:
The OUI version must be 10.1.x.x.x. The latest 10.1.x.x.x version can be downloaded from MOS.
Refer to Patch 6640838
Please verify that you select a 10.1.x.x.x version.  Do NOT select 10.2.x.x.x or 11.x.x.x versions.

This patch should be applied to the Forms ORACLE_HOME that is going to be patched with the overlay technique. This means Forms Bundle Patch:9593176 - or higher needs to be installed in this ORACLE_HOME.
This is a requirement for installing overlay patches.
The overlay patch must have been built on top of the Bundle Patch installed.
Do not get confused when the version number of the OUI  patch is 10.1.0.6.0, the OUI version you have already installed.
The version number was not changed when creating the patch, but missing components have been added.

Reference :-

How to patch OUI for installing overlay patches on top of Forms Bundle Patch - 9593176 [ID 1301320.1]

Steps for the Installation of the OUI patch:

1. Unzip the patch.

2. Run 'runInstaller' from the ..cd\Disk1\install directory

3. Click "Next" on the Welcome page.

4. Select the ORACLE_HOME of your existing Forms installation with Bundle Patch applied.

5. Click <Next>.

6.  Choose the install type of "Custom".



7. Click <Next>.

8. On the "Available Product Components" page, check the "Show all components, including required dependencies" checkbox.
9. Click the "Expand All" button.



10.  Under "Oracle Universal Installer 10.1.0.6.0" -> "Required Dependencies" ->

Click on "Installer SDK Component 10.1.0.6.0".

This will automatically select the other two instances of this option.



11. Click <Next>.

Note:  Depending on the configuration of your machine you may receive a screen entitled "Locate JDK Home" if the JDK home is not automatically found.  If you do see this screen, then accomplish step 12.

12.  Select a valid JDK directory.  Choose the JDK from the ORACLE_HOME you are patching:

Choose directory ORACLE_HOME\jdk where ORACLE_HOME is the ORACLE_HOME of your existing Forms installation where the Bundle Patch (9593176) was applied.

13. Press <Next>

14. On the "Summary - Oracle Installation Products 10.1.6.0" screen, you will something similar to the following. It may differ slightly but generally should look as follows:

Reinstallations (1 product)

--Installer SDK Component 10.1.0.6.0

Upgrades (2 products) (Note: May say 1 product if JRE 1.4.2.4 was already installed)

--Java Runtime Environment 1.4.2.4.0
--Oracle One-off Patch Install 10.1.0.6.1

New Installations (2 products) (Note: May say 3 products and include Oracle Software Packager 10.1.0.6.0 if it needs to be installed)

--Oracle Installation Libraries 10.1.0.6.0
--Oracle Installation Products 10.1.0.6.0

Already Installed (2 Products) (Note: May say 3 Products if  JRE 1.4.2.0.4 needs to be installed)

--Oracle Universal Installer 10.1.0.6.0
--Sun JDK 1.4.2.0.6



15. Click <Install> to complete this installation


It is important that OPatch be  version 1.0.0.0.62 at this point so verify this patch installed OPatch 1.0.0.0.62

Verify the OPatch version by executing "opatch version" in the Forms ORACLE_HOME/OPatch
directory or by having this directory as part of the PATH environment variable.

After OPatch has been installed, ensure the PATH environment variable contains the correct location.

At this point, the OUI and OPatch utilities are installed and ready to apply overlay patches.
Each overlay patch will contain a README.txt file that will provide specific
installation instructions, but all will require this OUI and OPatch configuration.

Overlay patches can now be installed on top of Forms Bundle Patch.

Result:-

[ebsmac@applusr 11710576]$ opatch apply

Oracle Interim Patch Installer version 1.0.0.0.64

Copyright (c) 2009 Oracle Corporation. All Rights Reserved..

Oracle recommends you to use the latest OPatch version

and read the OPatch documentation available in the OPatch/docs

directory for usage. For information about the latest OPatch and

other support-related issues, refer to document ID 293369.1

available on My Oracle Support (https://myoraclesupport.oracle.com)

Oracle Home           : /s001/apps/tech_st/10.1.2

Oracle Home Inventory : /apps1/apps/tech_st/10.1.2/inventory

Central Inventory     : /apps1/oraInventory

   from               : /etc/oraInst.loc

OUI location          : /apps1/apps/tech_st/10.1.2/oui

OUI shared library    : /apps1/apps/tech_st/10.1.2/oui/lib/linux/liboraInstaller.so

Java location         : /apps1/apps/tech_st/10.1.2/jre/1.4.2/bin/java

Log file location     : /s001/apps/tech_st/10.1.2/.patch_storage/<patch ID>/*.log

Creating log file "/s001/apps/tech_st/10.1.2/.patch_storage/11710576/Apply_11710576_03-10-2013_21-18-39.log"

Invoking fuser to check for active processes.

Patch "11710576" overlays " 9593176 ". Conflict check between them is skipped.

Provide your email address to be informed of security issues, install and

initiate Oracle Configuration Manager. Easier for you if you use your My

Oracle Support Email address/User Name.

Visit http://www.oracle.com/support/policies.html for details.

Email address/User Name:

You have not provided an email address for notification of security issues.

Do you wish to remain uninformed of security issues ([Y]es, [N]o) [N]:  y

Oracle Configuration Manager has been installed but not configured. OCM enables

Oracle to provide superior, proactive support for our customers. Oracle

strongly recommends customers configure OCM. To complete the configuration of

OCM, refer to the OCM Installation and Administration Guide

(http://www.oracle.com/technology/documentation/ocm.html).

Backing up comps.xml ...

OPatch detected non-cluster Oracle Home from the inventory and will patch the local system only.

Please shut down Oracle instances running out of this ORACLE_HOME

(Oracle Home = /s001/M1DEV01/apps/tech_st/10.1.2)

Is this system ready for updating?

Please respond Y|N >

y

Applying patch 11710576...

Patching copy files...

Inventory is good and does not have any dangling patches.

Updating inventory...

Verifying patch...

Backing up comps.xml ...

OPatch succeeded.

[ebsmac@applusr 11710576]$

The same issue, I also faced for Patch 17303472: MERGE REQUEST ON TOP OF 10.1.2.3.2PSU FOR BUGS 16784403 6166808 13913713