ORA-23535: instantiating templates from multiple back ends is not allowed.

Cause : An attempt was made to set a new non-null back end database for an iAS site.

Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts

Call dbms_ias_configure.set_back_end_db procedure with null dblink. Then, call the same procedure with the new non-null dblink.

update : 27-06-2017
ORA-23535

ORA-23535 - instantiating templates from multiple back ends is not allowed.
ORA-23535 - instantiating templates from multiple back ends is not allowed.

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    Well, the reason for above error is that i have taken the above script from a 11g database and running it on 10g database. 11g has bring some changes in password management. Below code is executed on 11g and user created successfully, which is expected result.