[TYPO3-templavoila] DS: getting values from a field inside a section/container

[Chris]

I have a datastructure like this :

field_10
field_20
etc...

then :

field_30 (section)
- field_40 (container)
-- field_50
-- field_60

inside my fields 50 & 60 I would like to get values from field_10 or 
field_20

------------------------------------------------------------------

If I do this in field_20 :

10=TEXT
10.field=field_10

It works OK

...but it doesn't if I use the same code in field_50 or 60


is there any way to make this work ?
this would be very helpful  ;-)

Thx,

Chris
chris at oblady.com