Cart Creation and PO Output

We've recently upgraded to SRM 7 so I'm still learning all it's little tricks! At the shopping cart creation stage is there an option to choose not to issue the PO output the vendor?

This is a very basic question and ssomething I should really know, I'm ashamed to say I don't! I'm guessing the answer is no but I would really appreciate if someone would confirm this for me please.

I did workout that when editing a PO, if I go into 'Header'>'Output'>'Additional Output Requested Via' and I change the option from 'Email' to 'XML' the revised PO doesn't get issued to the vendor - I was just wondering if something like this can be applied at the shopping cart creation stage?

Many thanks,

Zena