numeric sorting doesnt work

[Serge Brami]

I have a very simple stack  i have tried to make a banking account  
report.
Column 1 = DATE
Column 2 = TEXT
Column 3 = NUMBER with 2 decimals
Column 4 = NUMBER with 2 decimals

if i want to sort Column 3 or 4  by numeric ascending or descending it  
doesntwork (either choosing the sort key in the group inspector or by  
script)
mac OS 10.5 french system

I send this little stack attached ....help  thanks


by the way i signal a little bug (not very important but...) if you  
try to delete a datagrid  you select it and you delete it taping  
backkey or choosing delete a standard alert answer  dialog comme to  
front "would you like to delete the record template associated with  
this data grid this action cannot be undone"  with two button  
choiceYES and NO  (which is preselected) if you choose NO the datagrid  
IS DELETED if you choose YES the datagrid is NOT DELETED) ...
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