Hello
I'm not sure I understand, but it seems this question is more a VIrtuemart question.
On my side, I don't see issue with this Multivendor option when adding products to cart.
Can you precise ? (in english please)
- Need help? Post the URL of the related page (eventualy as confidential info), it will help solve your issue faster.
- An error, notice or warning? report the exact message including the line number
- If you get a white page , enable error reporting and / or check your server error logs.