When creating relations between two materials in the OSP Collection, you can use a material's numerical identifier in the relation field in place of its URL.

For instance, when creating a relation to Exoplanet Detection: Transit Method from another record, in the URL field you can just enter in the number 10156.

While the system should figure out the interrelations from the URL, using this shortcut ensures the linking occurs between records.

Let me know if you have any questions,
-Lyle