Unable to add usage item in service contracts.

Hi All,

I am in an implementation project and I have faced a scenario where my client is selling service (Technology) to customer and getting the payment for the service as one time payment and after that client will receive royalty from the customer as per their usage of technology to make goods by their customers.

I have planned for a solution:

1. Create a service item 's1'.

2. Create a Stockable/Physical item 'p1'.

3. Create a usage item 'u1'.

4. Create entry in price list for all.

5. Create a counter definition with association type as Trackable with item association p1.