Apply ETCC patch first or CPU patch first.
We followed the ETCC report to apply all the patches then want to apply CPU patch 26925311.We met patch conflict as below(CPU patch 26925311 conflict with other ETCC patch).Searched on MOS and find note 《Database Patch Set Update Overlay Patches Required for Use with PSUs and Oracle E-Business Suite (Doc ID 1147107.1)》 , I found section "Table 1 Release 12.1.0.2 PSUs and Patch Lists for EBS r12.2 customers not using the In-Memory option" ,it provide a workaround for "Overlay Patch To Apply If 12.1.0.2.180116 PSU 26925311 is Already Applied" but how to handle with patch 26925311 conflict with others?
CPU PATCH
tst-ebs-db
cd /CPU2018PATCH/27010839/26925311
export PATH=$PATH:$ORACLE_HOME/OPatch