SQL Server 2014 :: Update Old Data With New Data

I got this script but all I get are the errors:

Msg 209, Level 16, State 1, Line 8
Ambiguous column name 'PartNrFabrikant'.
Msg 209, Level 16, State 1, Line 8
Ambiguous column name 'omschrijving'.
Msg 209, Level 16, State 1, Line 8
Ambiguous column name 'verkoopprijs'.
Msg 116, Level 16, State 1, Line 13

Only one expression can be specified in the select list when the subquery is not introduced with EXISTS.

script:
UPDATE artikelen
SET omschrijving = [Hofstede].[dbo].[sparepartsupdate].[omschrijving] ,
verkoopprijs = [Hofstede].[dbo].[sparepartsupdate].[verkoopprijs] ,
gewijzigd = getDate()

[code]...