Oracle Inventory corrupted

Question

We installed several QA systems (BI, GRS, Portal, ECC) with their ORACLE_HOME's within the same UNIX box but when SAP ask for each ORACLE_HOME's name and path's to install we mistakenly don't change the name and just the path so the only recognized installation in the inventory is the last one.
Because of the above the oracle opatch utility is getting the following error with all but with the last one. So we cannot do patching to this instances. Can any one suggest a solution to re-inventory all oracle home's with the proper names?
$ $ORACLE_HOME/OPatch/opatch lsinventory
Invoking OPatch 10.2.0.2.0
Oracle interim Patch Installer version 10.2.0.2.0
Copyright (c) 2005, Oracle Corporation.  All rights reserved..
Oracle Home       : /oracle/QR1/102_64
Central Inventory : /oracle/oraInventory
   from           : /etc/oraInst.loc
OPatch version    : 10.2.0.2.0
OUI version       : 10.2.0.2.0
OUI location      : /oracle/QR1/102_64/oui
Log file location : /oracle/QR1/102_64/cfgtoollogs/opatch/opatch-2008_May_07_11-27-00-EDT_Wed.log
List of Homes on this system:
  Home name= OUIHome1, Location= "/oracle/QG1/102_64"
Inventory load failed... OPatch cannot load inventory for the given Oracle Home.
Possible causes are:
   Oracle Home dir. path does not exist in Central Inventory
   Oracle Home is a symbolic link
   Oracle Home inventory is corrupted
LsInventory Session failed: OracleHomeInventory::load() gets null oracleHomeInfo
OPatch failed with error code 72

Answer 1

Just to let you know guy's, the problem is fixed now by following the next procedure.
Goal: For each Oracle/SAP database within the server use one
independent Central inventory (/oracle/<SID>/oraInventory)
Steps for each ORACLE_HOME installed
0. Rename the old oraInventory directory (just one time & optional)
1. Create one new oraInventory dir at /oracle/<SID>/oraInventory
2. Create one new oraInst.loc pointing at oraInventory created
3. Recreate the Central Inventory by running the runInstaller as
established in the metalink note Note:556834.1 step 4 and adding the
label -invPtrLoc pointing at the new oraInst.loc file location.
Basically the 3rd point looks like this.
$ ./runInstaller -silent -invPtrLoc /oracle/QP1/oraInst.loc ignoreSysPrereqs -attachHome ORACLE_HOME="/oracle/QP1/102_64" ORACLE_HOME_NAME="OUIHome1"
Starting Oracle Universal Installer...
No pre-requisite checks found in oraparam.ini, no system pre-requisite checks will be executed.
0: 108        /, /dev/hd4, -, rw,log=/dev/hd8, 0
One invalid entry
1: 112        /usr, /dev/hd2, -, rw,log=/dev/hd8, 0
One invalid entry
.... (lots of output here)
One invalid entry
The inventory pointer is located at /oracle/QP1/oraInst.loc
The inventory is located at /oracle/QP1/oraInventory
'AttachHome' was successful.
$ $ORACLE_HOME/OPatch/opatch lsinventory -invPtrLoc /oracle/QP1/oraInst.loc
Invoking OPatch 10.2.0.2.0
Oracle interim Patch Installer version 10.2.0.2.0
Copyright (c) 2005, Oracle Corporation.  All rights reserved..
Oracle Home       : /oracle/QP1/102_64
Central Inventory : /oracle/QP1/oraInventory
   from           : /oracle/QP1/oraInst.loc
OPatch version    : 10.2.0.2.0
OUI version       : 10.2.0.2.0
OUI location      : /oracle/QP1/102_64/oui
Log file location : /oracle/QP1/102_64/cfgtoollogs/opatch/opatch-2008_May_08_22-51-27-EDT_Thu.log
Lsinventory Output file location : /oracle/QP1/102_64/cfgtoollogs/opatch/lsinv/lsinventory-2008_May_08_22-51-27-EDT_Thu.txt
Installed Top-level Products (2):
Oracle Database 10g                                                  10.2.0.1.0
Oracle Database 10g Release 2 Patch Set 1                            10.2.0.2.0
There are 2 products installed in this Oracle Home.
There are no Interim patches installed in this Oracle Home.
OPatch succeeded.
*Thanks again for your support.*
Eduardo.