Could you please provide a minimal schema, that reproduces the problem? From your description I understood your description as this (simplified):

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drop view ViewGroupsFull;
drop view demo;
drop table TableGroupInfos;
drop table TableTimetables;
drop table TableGroups;
create table TableGroups (
    groupId int primary key, 
    title varchar(255)
);
create table TableGroupInfos (
    tableGroupInfoId int primary key, 
    groupId int references TableGroups(groupId), 
    info1 varchar(20), 
    info2 varchar(255)
); 
create table TableTimetables (
    timeTableId int primary key,
    title varchar(255), 
    groupId int references TableGroups(groupId)
);
create view ViewGroupsFull as 
    select tg.title as groupName, 
           tgi.info1 as info1,
           tgi.info2 as info2,
           tg.groupId as id
    from TableGroups tg
    left join TableGroupInfos tgi ON (tgi.groupId = tg.groupId);
create view demo as 
    SELECT  *
    FROM dbo.TableTimetables 
    INNER JOIN dbo.ViewGroupsFull ON dbo.TableTimetables.groupId = dbo.ViewGroupsFull.id;

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This does not reproduce the problem (I can generate entities from this).

Could you please check, that the problem is still there in netbeans 8? There was a fix committed for netbeans 8 - please check bug #239181.