Hello, i user APEX 4.2.1.00.08 in Database 11g
I new in apex and a try to use String Substitutions.
When I define a String like CONST with static value like '999' in Edit Applications Definition it's work fine.
But I need to define the same String 'CONST' but with value to return from PL/SQL function like.. Package.function
It's Possible ??
No, you'll need to use application items instead - or pass the value as parameter to your function.
Passing parameters like this makes for good practice anyway, since your modules become more testable outside the apex environment, and more robust.