PLS-00721: 'string' formed a non-REF mutually-dependent
cycle with 'string'



PLS-00721: 'string' formed a non-REF mutually-dependent cycle with 'string'..

Answer / guest

Cause: 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);

Action: Break the cycle (possibly by adding a REF or by
using another type).

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