a simple trigger (gnue-forms)

Hello,

Since in this period i don't have many things to do at work, i've
decided to use some of this spare time for gnue.

I am trying to create a trigger (POST-CHANGE) that copies the value
from one field (fldPu)  iinto another (fldVal).


Setting a fixed value (16) works:
       <field name="fldPu" field="pu" typecast="number">
         <trigger name="Trigger1" type="POST-CHANGE"><![CDATA[##
## fldPu.Post-Change (Field-Level Trigger)
##
v = blkProd.fldPu
blkProd.fldVal = 16
return
]]></trigger>
       </field>


But this doesn't work :
v = blkProd.fldPu
blkProd.fldVal = v
return

( i don't have the traceback available right now because i'm writing
emails in windows ,  but my tests have been made in linux. ).


I have tried different variations:
blkProd.fldVal = float(v)
blkProd.fldVal.setValue(16)
blkProd.fldVal.triggerSetValue(16)


Does anyone know which is the correct way to get and set field
values ?


Thanks,
Adrian Maier