ITEM REST API to retrieve EFF

Summary

failed

Content

Hi,

Quick question -

I configured a EFF called 'ABC'. 

If I called end point (in postman) with 

https://URL/fscmRestApi/resources/11.13.18.05/itemsV2/{itemsV2UniqID}/child/ItemEffCategory/{itemsV2UniqID}/child/ItemEFFBItem__ClassPrivateVO

I can get response.

But if I called with child and nested child like below,

https://URL/fscmRestApi/resources/11.13.18.05/itemsV2?totalResults=true&limit=11&q=UPPER(ItemNumber) like 'AAA%'&expand=ItemEffCategory.ItemEFFBItem__ClassPrivateVO&fields=ItemNumber, I got the following error -

URL request parameter expand with value ItemEffCategory.ItemEFFBItem__ClassPrivateVO is not valid.

Any idea why I cannot use nested child ItemEFFBItem__ClassPrivateVO in the above end point?