Error while installing BO XI3.1

Hi,

We are installing BOXI3.1 on LINUX 64 bit server.

we had already installed oracle 10g for repository database on AIX 64 bit.

We have also installed oracle selec client 64 biton Linux server.

While installing BO we are stuck after selecting the option of using the existing database for repository.

when we give TNS name , Username of oracle schema created and password it gives the following erro.

Failure to validate the database credential has a potential to crash the database at a later stage. Enter the correct information. (STU00104)

Can somebody help in this case.

Thanks in advance