Fetch item custom field (data type) in Purchase order custom print format

I have added a data type custom field for MRP in item master, also I added it to purchase order item with same data type & name, I am trying to fetch it on my custom print format in items table.

Can any one help me ? I have tried custom script too, but no luck. Am I doing something wrong ?

Here is my config :-
Item master > data type field > field name = item_mrp
purchase order item > data type field > field name = item_mrp > options = Item

print format > {{ item.item_mrp }}

but it shows none as value.

Please help

Never Mind. I did it.

I am on v12 it doesnt fetch value if the fields have same name, I added the code item_code.item_mrp in fetch from field.