How to find the Shopping cart Number using PO Number

Hi,

I want to take my shopping cart number and using my PO number.

How do i get the shopping cart number which related to PO number. Is there any table to related each other.

Web-GUI I found that in followon documnet but how do i get it from backend(SRM) system.

Can you any one please share your Idea.

Regards,

Senthil.

The points will rewared.