Hi,

You can use related field. So it won't be saved in the db. 

image_field = fields.Image('Image', related="product_id.image_variant_1920") 

(considering it's from product.product).

And give xml ->

<field name="image_field" widget="image"/>

Regards

Thanks for your reply.  I am not understanding how I match the image in the MRP Module with my custom module.  Would you be able to explain how 'related' works across different modules?

In my module I am storing the Manufacturing Order for a product thats defined in MRP module - the id starting WH/MO/.... and I had hoped to use this to find the relevant image stored in products.

In the related bit of your example you have product_id - is this a field called 'product_id', or is it the 'id' field in the product model?