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Update a Delivery Note

How to update selected Delivery note. Through Rest API

Did you check https://frappeframework.com/docs/user/en/guides/integration/rest_api/manipulating_documents ?

yes

I want to add an item to the delivery note’s items array, So I have used PUT API to update the record.

It gives the PUT API’s response correctly. But when I fetch that record again through GET API, It seems like not updated.

Why???