This is the case of the little fish. Most corporates have a procurement system and you have to work with them. The little fish generally has to given and work with the bigger company's system. Most bigger companies have a standard vendor, PO, procurement system and you can't do a whole lot with it. There are some minor ways to request amended terms but this requires some more follow up discussion. Meaning I would want to get a sense of what the 'ridiculous terms' look like and see what can be countered.

Let me know if you want to chat more,
Thanks,
Madhu