Hi Dan Dumitrascu,
Greetings from Syncfusion.
SelectedValue of SfAutoComplete sets the value based on the SelectedValuePath property. If the SelectedValuePath property null, then only it will take the value from DisplayMemberPath. We have prepared a sample for the same, please download the sample from the link given below.
In the above sample, we have set the SelectedValuePath property to a collection, so that whenever we select an item from drop down the SelectedValue will get the value from SelectedValuePath.