Hi @psouto,
This forum is for software developers using Thomson Reuters APIs. The moderators on this forum don't have the expertise to answer general product or content search and explanation questions for Thomson Reuters products.
For this question on the methodology of Datastream price data it is best to contact Thomson Reuters Helpdesk by either calling the Helpdesk number in your country or by following the link below: http://my.thomsonreuters.com/ContactUsNew
If there is any option to choose retrieving data without splits and dividends, data should come adjusted... But thanks! I'll get in touch with our helpdesk