Usage of multiple currencies while creating shopping cart

Dear SRM experts,

I want to configure my system such that when i create a shopping cart i must be able to add different items using different currencies.

that is,

Shopping cart has item X and Y. item X has currency EUR. item Y has currency USD.

currently what happens is that i am able to create a such a shopping cart. but after that the shopping cart goes into approval. the approval workflow cannot be determined.

i am not sure if this happens because of workflow config not being done or this scenario requires a special configuration.

We are currently on SRM 5.0.

Could someone help me to configure this?

Thanks & Best Regards,

Vidhya