Regarding Limit orders & backe-end contract

Hi

I have some questions on shopping cart $ back-end contract.

Q1) In the standard srm solution, In the case of material/service shopping cart , in source of supply , is it possible to access or use the backe-end contract in classic scenario?

Q2)In the standard srm solution , In the case of limit shopping cart , in source of supply , is it possible to access or use the backe-end contract in classic scenario?

Pleae give me the solution..

Thanks

Raj