Make a Standard DD on Update, or a Method Directive on Update.
In post, check for any dtl lines that meet your criteria.
Update field appropriately.
Method directive on Update-> post processing works I guess.
Need to keep this code through loops. Any examples? Sorry for having those questions. Not that good at coding.
So, for my case:
I created a field at Order-Hed level to store values under SO form. With help of BPM it worked. Took the easy way I believe.
Created a BPM at SalesOrder.Update->PreProcessing
Condition:
Added argument/variable to keep count of number of lines
Used Custom Code to display value in Custom Orderhed field.
// …
Erp.Tables.OrderHed OrderHed;var OrderDtlRow = ttOrderDtl.FirstOrDefault();
int OrderNum = (int)OrderDtlRow.OrderNum;OrderHed = (from OrderHed_row in Db.OrderHed
where OrderHed_row.Company == Session.CompanyID
&& OrderHed_row.OrderNum == OrderNum
select OrderHed_row).FirstOrDefault();if (OrderHed != null)
{
// Get the previous count
decimal previousCount = OrderHed.TotalQuantities1_c;// Add the current count decimal newCount = previousCount + Count1; OrderHed.TotalQuantities1_c = newCount;}
This way whenever a new line is added, system will look for custom part and adds a value in the Custom field at Orderhed.
I reversed the condition and custom code if line is deleted. This way it subtracts the values.
Code:
I used this value at my email notifications. If value is not equal to 0 means there is a ZZZ part and send an email.
Thank you everyone for your valuable time and input. Much appreciated !! 
Glad you got a solution. If you can get the .Any statement working it does the same without any looping or math in the one line.
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