Getting the message 'No Suitable namespace available' while creating role

Hi Gurus ,

I am trying to create few roles named staring with the characters like /DCR/N000S01.

But i get the message 'No Suitable namespace available' .

Although i am still able to create the role after this .

Can you please let me know why are we getting this mesage ?

Also I am using the BAPI ' PRGN_RFC_CREATE_ACTIVITY_GROUP ' to create roles.

When i input the value of the role name as DCR/N000S01 its throwing an exception as NAMESPACE_PROBLEM .

So kindly let me know why do we get the message as 'No Suitable namespace available' when we try to create roles with names such as /DCR/N000S01 and what is the resolution ?

Thanks in Advance ,

Amit