PLS-00421

Error: PLS-00421: synonym definitions nested too deeply; possible loop in synonyms

Causa: Directly or indirectly, a synonym was defined in terms of itself, creating a circular definition. Or, a chain of synonyms, too long for the PL/SQL compiler to handle, was defined.

Acción: Redefine the synonyms to eliminate the circular definition. If necessary, shorten the chain of synonyms.