Options while creating Virtual Cube in BW3.x

Hi Everyone,

My ques. is regarding the options that we see while creating a Virtual Cube :-

1. If we select SAP Remote Cube, we see a check box that says "Clear Source ".

2. If we select Gen. Remote Cube, we see a check box that says " Execute Conv. Exit".

3. Option named "With Services"

Can anyone tell me that what do these Options mean and what do they do ?

Thanks.

Ashwani