Problem: Can't level added spells higher than lvl 3

Hi, I've got a serious problem with my map and hope you can help me.

In my Map, I use the following system to add spells to heroes:

The hero starts with a dummy spell, that is deactivated for him.
He can buy various items, and for each item he buys I add via trigger another dummy spell based on this upgradespell of the Tinker.

This upgradespell is also hidden for the player, and replaces the dummy spell with the spell he want to learn.

Well, it works fine, my only problem is: It works only fine until level 3...after that, the spell disappear in the skill menue. But if you give the spell to a hero the normal way (in the objekt editor), you can learn the spell till level 5 (how it's supposed to be).

So I guess the problem has to be something with this system.

Can anyone help me out? Thank you much and kind regards,
Murder X

I haven't tested it yet but try setting the dummy spell max level to 5 aswell, I remember that some properties of the dummy spell remain. (I'll set up a test map and tell you the results later ^^)

EDIT:
Yup just tested, this is your way to go. The dummy spell that gets replaced must have the same level cap as the one replacing it. And I found where I got the info the first: here

YEAH :) It worked, halleluia :) Thank you very very much