The 'textProperty' part of the row object points to the property of the current SData object. Meaning in your querySelect for that view you may have something like:
querySelect: [
'Account/AccountName',
'AccountManager/UserInfo/FirstName',
'AccountManager/UserInfo/LastName',
'CreateDate',
'CreateUser'
],
AccountName and UserInfo are the 'textProperty' of 'Account' and 'AccountManager' (the name formatter handles taking the UserInfo object and getting the first/last name rendered properly).
So the first thing I would do is make sure your querySelect has a Account/Name, or if it is like the eval database your textProperty should be AccountName (which would match Account/AccountName in the querySelect).
To see that in the code, the Edit view does a 'get all values' for all of the fields. In Controls/LookupField.js, you see in getValue it calls:
text = U.getValue(val, this.textProperty);
With the U being Utility, which looks like:
getValue: function(o, name, defaultValue) {
...
if (typeof current[key] !== 'undefined')
current = current[key];
...
So it loops through the object (the 'name' part of the row object in layout) looking for that key (the textProperty) so it looks for Account['AccountName'] - which in SData Query (which is hql?) notation is Account/AccountName.
