Basically I need to be able to create new entries in a lookup table. I’ve tried using the _api/ProjectServer/LookupTables('{tableid}')/Entries/Add endpoint and it does somewhat work, but due to the fact that i have to set the SortIndex upon creation, i get duplicate values on that property after the entry has been successfully created, leading to error on subsequent requests.

We’re tracking emails that we send using the Sharepoint API. What we’re doing is adding a transparent pixel that’s hosted on our server, and the request tells us that the emails was opened. We want to register the opening by user, and for that, the URL of the image has a code as a query parameter, for example: