Api request fails with filters

[CostaRica]

Here’s the answer to this limitation:

url/api/resource/Quotation%20Item not working

Child documents are not first class due to complex permission rules that may be applied on the parent. You can query parent objects or write your own whitelisted method to return child documents.

and

Access/GET Dynamic Links/Child Table in REST API

I got it, @peterg The API returns all the Child Documents ONLY when you call it in the form of: https://example.com/api/resource/Doctype/DoctypeName and there is only one result, but NOT when you call the API with filters like this: https://example.com/api/resource/Doctype/&filters=[["Doctype","fieldname","=","criteria"]]