Most of the issues i have faced.. This article will save your time
Microsoft has suggested developers to start using the new Web API to develop new custom development. As they are planning to deprecate the 2011 endpoints sometime after CRM version 9 (We are on version 8 now!). Ref: https://msdn.microsoft.com/en-us/library/dn281891.aspx
I found out it is quite interesting on one of my custom entity, let’s call it “cust_selectionmatrix”. I tried to build the query using the tool, but I won’t generate the query as expected. Then I tried to look at Microsoft examples around the Web API query. Most of them are appending “s” against the entity name. E.g: for account: /api/data/v8.0/accounts and for contact: /api/data/v8.0/contacts.
So my first trial is just adding s at the end of my custom entity:
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