Have you define manufacturer_pref field in this object ?

Yes, on the line just above:

'manufacturer_pref': fields.related('product_id', 'manufacturer_pref', type="char", relation="product.product", string="Manufacturer", store=True),

Hi tyr this 'manufacturer' : fields.related('manufacturer_pref','manufacturer',type="char", string="Manufacturer",store=True),

wait, I have deleted the column manufacturer from db, Created a new line, no errors but no data for manufacturer, will tell you more in a sec as I just have restarted !

value of manufacturer_pref this field come in to manufacturer ? if there is value in manufacturer_pref then manufacturer field have value.

No finaly, still getting TypeError: string indices must be integers

both manufacturer_pref and manufacturer are from product.product table, only thing is that manufacter is the id number from res_partner table.

Then define many2one with res_partner

I have tried it, did not work, may be I defined it wrong, will give it another try. If I put it in words, it would be:

I have an order line which has 1 product. I get the manufacturer_pref of that object from product.product table I need the name of the manufacturer of the manufacturer_pref from the table res.partner.

So the product 1482010000 (id 25781 in product_product) has a manufacturer "id 1654". In res.partner, id 1654 "Name" field is Micro Commercial Component <---- This is what I want to get in my field manufacturer in purchase.order.line.

Is that making more sense ?

'partner_id' : fields.many2one('res.partner', 'Partner',),

'manufacturer' : fields.related('partner_id','manufacturer' ,type="char", relation="res.partner", string="Manufacturer",store=True),

Already had an object partner_id in that object that was causing a conflict, I have modified your lines to avoid conflicts.

        'manufacturer_id': fields.many2one('res.partner', 'ManufacturerID',),
    'manufacturer' : fields.related('manufacturer_id','manufacturer' ,type="char", relation="res.partner", string="Manufacturer",store=True),

I dont get errors anymore but, the manufacturer name still not showing up. when looking in the table with pgadmin3, the line gets value for every fields except manufacturer_id and manufacturer.

Thing I dont get in your code, since I am only typing the default_code (from product_product table), and it has to gather the rest, where do you make the link between my product on that line, it's manufacturer(id) in product.product and the name in res.partner.

to be clear in my question, to get the manufacturer_pref, I had to tell him to use the product_id and get it's manufacturer_pref in product.product.

'manufacturer_pref': fields.related('product_id', 'manufacturer_pref', type="char",  relation="product.product", string="Manufacturer", store=True),

(follow)

So, to get my manufacturer, I would need to use the product_id, get the manufacturer field in product.product (which has the id of the partner) and link id the the field name in res_partner table ?

'manufacturer' : fields.related('manufacturer_id','manufacturer' ,type="char", string="Manufacturer",store=True),

Same behavior, but, should the manufacturer_id be the one from product_product table something in the line of

'manufacturer_id': fields.related('product_id', 'manufacturer', type="char",  relation="product.product", string="Manufacturer", store=True),

which would give the manufacturer id for that product then, we could link it to res.partner name field ?