I will try with the sql generated by Doctrine. But the problem I got was when I have more than 2 levels of the inheritance hierarchy. When try to make an insert trough the lowest level (in my example the DDC732Driver. Actually it was not working with the DDC732Employee entity as well) the order of inserting was not correct. First it went trough the correct entity (in my example the DDC732Contacts), but then instead of going through DDC732Person it try to go trough the last level (DDC732Driver or DDC732Employee depending on the example). And then the MySql said that it can not go trough. Also maybe the reason is that I am using InnoDB, but then it shouldn't really matter because I thought that the hierarchy inheritance is supposed to work with it. Actually I am almost 100% sure the problem is in the InnoDB could you please try with it. If it is still working for you i will reexamine my application and find the mistake.
Thanks in advance for the help and sorry. Now on second thought I should have explained all that in the beginning.