[TYPO3-templavoila] Editing Data Structure

[Historia]

I try to change some values in templavoila and every time I click 
update, the value is changed back.

I googled a bit and found the solution of editing the xml directly. But 
finding all my way through is somehow strange when it could be done in 
the nice editor. Changing between the visual editor and the xml source 
is not very straightforward.

I am working with TV 1.4.1 and 4.3.0.

Herbert