Set at least one of the attribute types to match the 'Account' or 'Time' dimension type
This rule analyzes dimensions to determine whether the dimension contains at least one attribute that is of the same type as the dimension.
Best Practices Recommendations
You should set the Type property of at least one attribute to match the dimension type.
Analysis Services uses account and time information to enable specialized behavior. It is not enough to just define the dimension as an account or time dimension. The attribute's type must also be set to be compatible with the dimension type.
For More Information
For more information, see Configuring Attribute Types in SQL Server Books Online.