Hi all.  
  
I 'm playing with parent/child relationship columns and I've tried  
  
AGGREGATE functions.  
  
My test is simple:  
  
I've created a table "C" with 2 columns:  
  
"Price" and "P_ID"  
  
and a table "P" with 2 columns  
  
"P_ID" as primary key and  
  
"SumPrice" to contain computed values.  
  
I've created a relationship  
  
PCol = ds.Tables["P"].Columns["P_ID"];  
  
CCol = ds.Tables["C"].Columns["P_ID"];  
  
rel = new DataRelation("P_C_rel",PCol, CCol);  
  
and added to the dataset.  
  
Then I've specified an expression for the column SumPrice  
  
SumPriceCol.Expression = "Sum(Child.Price)";  
  
It works fine if I change only table "C" "Price" elements but it  
  
doesn't work if I change table "C" "P_ID" elements.  
  
It seem like it doesn't refresh value immediately  when i change row,  
  
but it processes changes one step later.  
  
In fact if I change again "P_ID" values, computed column displays a  
  
value that was correct with the previous input.  
  
Surely I'm missing something.  
  
Can someone help, please?  
  
Thanks.  
  
Maurizio.

V1.1 had issues with updating values based on expressions when relationships  
  
are involved.  
  
If/when you can try V2.0 all those issues should be corrected.  
  
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