spaces and special characters in member data

Hi

when I am trying to load master data from bi infoobject to bpc dimension, it is throwing error,

"Master data (dealt by table level) has errors

Dimension member HBV PreS@ + S Antigen/MF59 is an invalid member ID"

I know special characters are not allowed as member id in dimesion member sheet.

How to resolve this issue 

regards