ORA-30688

Error: ORA-30688: maximum program calling depth exceeded

Causa: Your program contains a set of calls that are too deep to be handled. Only transitions between the different execution engines (SQL, PL/SQL, and Java) count in reaching this limit; calls within the same engine don't count.

Acción: Restructure your program so as to not call so deeply. Perhaps some recursion can be replaced with iteration.