brotherton-erpnext/docs/dev/custom_script_examples/docs.dev.custom_script.fetch.md

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Custom Script: Fetch Values from Master

To pull a value of a link on selection, use the add_fetch method.

add_fetch(link_fieldname, source_fieldname, target_fieldname)

Example

You create Custom Field VAT ID (vat_id) in Customer and Sales Invoice and want to make sure this value gets updated every time you select a Customer in a Sales Invoice.

Then in the Sales Invoice Custom Script, add this line:

cur_frm.add_fetch('customer','vat_id','vat_id')

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See: How to create a custom script