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Hello,
When SaveChanges() is called getting ORA - 01779 cannot modify a column which maps to a non key-preserved table
error, any idea what's Is causing this?

Please enable dbMonitor and check the generated SQL statement. It should help to localize the problem. The cases when "ORA-01779: cannot modify a column which maps to a non key-preserved table" occurs:
* https://stackoverflow.com/questions/170 ... rved-table
* https://asktom.oracle.com/pls/asktom/f? ... 0346825287

Send us a small test project with the corresponding DDL/DML script so that we can reproduce and investigate the issue.

thanks for tip and link, they helped find the reason
as well very handy dbmonitor.