I have an url in such format: resource_1/{id_1}/resource_2/{id_2}/assign.
I know how to create a simple proxy resource with 1 path param. But in my case I got two.
So I decided to create it one by one, at first resource_1/{id_1}/ and then expand it to resource_2/{id_2}/assign and as you see on picture, action Create Resourcce is blocked on initial proxy resource.
How can I solve this issue to have endpoint with 2 path params?

This is because your
id+is a proxy resource, as indicated by the+sign.From the doc :
Remove the
+sign from your parameter name and you will be allowed to create sub resources.