Oracle Error Message
PLS-00721: ‘string’ formed a non-REF mutually-dependent cycle with ‘string’
Reason for the Error
This compilation was aborted because the library unit that was compiled would have formed a non-REF mutually-dependent cycle with some other library units. This happens when an attempt is made to compile types that have attributes of other types that may participate in a cycle with this type. Example: create type t1; create type t2 (a t1); create type t1 (a t2);
Solution
Break the cycle (possibly by adding a REF or by using another type).
