Unable To Drop User Cascade Due To AQ Objects Belonging To That User - ORA-00600 [kzdukl3], 
(Doc ID 1524947.1)
Last updated on AUGUST 04, 2018
Applies to:Oracle Database - Enterprise Edition - Version 10.2.0.3 and later
Information in this document applies to any platform.
When attempting to drop a user the following error occurs:
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