Another way to do so is to create a text field and add the same expression in the field "related field". 

Model = account.move = journal entries = invoice

!You need to activate the debug mode! 

1) Add the text field in the form view 

2) Click on "More" button

3) In the "related field" field add the following expression 

"invoice_line_ids.sale_line_ids.order_id."

4) Add the name of the field, from the Sale Order model, you want to link with your invoice after the last dot. 

For example: "invoice_line_ids.sale_line_ids.order_id.PRICELIST_ID"

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