Posted by ErmanArslansOracleBlog on Apr 18, 2021; 3:49pm URL: http://erman-arslan-s-oracle-forum.124.s1.nabble.com/ADF-Faces-error-tp9627p9637.html
So it is a custom app. ADF & development in general is not in my focus, but I will try to help.
I think you have some problem in your application design.
You can find the query used in that ADF page, and use that query to check whether or not you have a duplicate record there..
If you don't have any duplicates in the primary key columns, then the cause may be a wrong use..
We see this in wrong LOV usages in ADF..