Dropship and return products?

Hi everyone,

Say I am using dropship model and my customer wants to return the product.

2 scenarios

a) my customer triggers a return (or rma) thru me. Then send the product back to me. And I will send the product to the merchant
or
b) my customer triggers a return (or rma) thru me. I will notify the merchant with the rma id. My customer will return to the merchant directly.

How could I simulate such in erpnext?

Thanks.

no one?