Ok, Then i hope as vadim mentioned PARENTH1 is not supported. So that is the reason why you are facing error. I too personaly never used Hirerarchy in SELECT statement.
So you can go with BAS() in the scope as vadim already mentioned. Or else if you need to skip some members then you can have a extra property in the Company code dimension. And you can use that property in your SELECT statement.
Aravind
