Hold on now! Who is the owner of the solution and who are the users? If you are the owner and you use this solution as well as your customers, then yes, you are okay. If you are the owner and your customer(s) is the only user of this solution, then you are okay only if your customer(s) access this solution as a service. This means your customer(s) don't directly direct, manage or fund the development or maintenance of this solution. If your customer is the owner of the solution, you are not okay because you are hosting a solution for a customer as well as for your own solutions.
Hope this clarifies things a bit.