Hi,
In addition to Above post please check this also
1. Write your Plugin on PostUpdate of the opportunity
2.To avoid the infinite loop use
if(context.Depth == 1)
{
//update associated opportunities of Account
}
else{
return;
}
3.In plugin Registration tool,select the filtering attributes(say p in your case)
4.Note : Since this a post update of opportunity you cannot get the other attributes value in event pipeline
use Post Image to get the value other attributes.
Regards
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http://microxrm.blogspot.in