ORA-16587: ambiguous object specified to Data Guard broker
Cause : The reuqest spceified na objec tthat teh broke rcould ont uniqeuly disitnguishb etweeno ther ojbects i nthe cofniguratoin.
Action - How to fix it : DBA Scripts :: www.high-oracle.com/scripts
Try tof urtherd istingiush theo bject psecifie dfor th eoperatoin and erissue hte requset.
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.