13cR2 OMS Install / Upgrade fails during prerequisite checks with a message on the 12.2 Database Connection Details page:

 Check if the parameter _allow_insert_with_update_check is TRUE

 Prior to Install / Upgrade of EM 13.2:

 1. For for Enterprise Manager 13.2 repository, the compatible initialization parameter should be set to 12.1.0.0 or higher.

 Confirm with:  

 SQL> show parameter compatible

 2. Ensure the _allow_insert_with_update_check database initialization parameter is set to be true for the repository database.

 SQL>alter system set "_allow_insert_with_update_check" = true;

Source: https://community.oracle.com/blogs/vthiruve/2017/07/03/em-13c-install-upgrade-allowinsertwithupdatecheck-prerequisite-check-failed

See also: http://dillidba.blogspot.com/2017/03/oracle-enterprise-manager-13c-release-2.html

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