In R12 after upgrade from 11i, none of the diagnostic tests are available under Diagnostic tab. To test this we submitted concurrent request "Diagnostics Patching CP" which is available from 12.1.1. This request completes normally and in the log file following errors are records,
[main][20:23:22:457, 9/4/11] Running oracle.apps.fnd.oam.diagnostics.cp.MigrateCustomizationData
[main][20:23:22:458, 9/4/11] $Header: MigrateCustomizationData.java 120.0.12010000.4 2009/06/30 11:40:28 sramados noship $
[20:23:23:532, 9/4/11] Test type xml file location = /oraprod/oracle/finprdcomn/java/oracle/apps/fnd/oam/diagnostics/config/fnddiagTestTypes.xml
[main][20:23:23:560, 9/4/11] INV:Onhand Material Status:INV_DIAG_OH_PLAIN_NO_STATUS Test type xml is not available at the expected location. Please refer log for more details.
[20:23:23:645, 9/4/11] Test type xml file location = /oraprod/oracle/finprdcomn/java/oracle/apps/fnd/oam/diagnostics/config/fnddiagTestTypes.xml
Had a very hard time last week, my phone crashed, my laptop hardisk crashed and was loaded with work.
For this reason I was not able to reply to anyone's comments or update my site with latest information. I should be able to do this in a day or two as I have got hold of a spare laptop. Still waiting for the data from my old hard disk to be recovered.