How to prevent record from setup table from deletion if it is used in atabl

i have two table setup table and master table
the setup table contains data from countries and i use this countries in master table
i want to prevenet a user from deleting country if it is used in master table
i know i can do this if i make a foreing key in setup table
but in this cases the exception message are raised from the data base
can i make this from the jdeveloper by asscociation and view object and customise the message that are raised to the user
thanks in advance

The question is why to program this yourself if it's available by the framework?
You can customize the error message raised by the db in the framework (there is a whole chapter in the docs).
Timo

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How to prevent record from setup table from deletion if it is used in atabl

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