EM 13c Install / Upgrade : _allow_insert_with_update_check Prerequisite Check Failed
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