Fetch Field in one doctype to onther doctype

ERPNext Accounting
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1

i create a two doctype item and customer in customer doctype i have pack price field i want fetch the base price field (item doctype) in to pack price(customer doctype) using script ply suggest me…

2

You probably dont even need script for this.

“Fetch from” does this. Fetch a Field Value from a Document into a Transaction

3

i try to fetch but i want to fetch parent doctype is (item) value in to child doctype is (customer doctype)