I am planing to apply RPC3 on ebs R12.1.3, and was referring the Doc ID 1986065.1.
Below is the extract from the same note, here do I need to go back to the Doc ID's and have to apply any/all missing patches even though I am on the latest (IAS ORACLE HOME=10.1.3.5.0 and ORACLE HOME=10.1.2.3.0) version or can I skip these notes as I have upgraded both the homes in the past?
<Moderator Edit - deleted contents of MOS Doc - pl do NOT post such content - it is a violation of your Support agreement>
To be in the safe side, apply the latest patches for the 10.1.2 and 10.1.3 oracle homes.
If you skip them and apply RPC3 then you might not face any issues.
I cannot confirm this as we usually update the two homes before applying RPC3.