The warehouse contract is one of the most essential requirements of this business model because it gives your business model a legitimate foundation to operate within Amazon's policies.
Starting with policies, Amazon's rule is simple: The seller information on all your orders must be yours and yours alone. Every order you send to your customers should only have your seller information on it, not other sellers.
The most important thing is that you must comply with Amazon's policy.
Sending products directly from suppliers to the buyer is strictly against Amazon's policies. To account for this, SR House will remove the previous supplier label and add your name and information to send to the customer in a way that makes it evident that it came from you.
If you already have a warehouse contract, you can still use SellerRunning with all its features.
This is why Amazon has approved SellerRunning as an Amazon-compatible drop-shipping software.