How to get and update item EFF using REST API?

Hi All,

I would like to get and update the EFF information of item. ref

REST API for Oracle Supply Chain Management Cloud - Get all extensible flexfields

I checked in table ego_item_eff_b, the item 300000003072020 has some attributes information using this SQL:

select * from ego_item_eff_b where INVENTORY_ITEM_ID =300000003072020

while I use get REST API, it return nothing.

May I know why?

Thanks in advance!