how to udpadate the opportunity field once product is created?

[sdfasd]

i created  field in Opportunity object    i.e Renewal Date.

once Product is added  to Particual Opportunity record  then automatically updated Renewal Date with Today Date .using workflow. please help me.......................................

[Burton024]

Use a trigger, not workflow.

Go to Your Name->Settings->Customize->Products->Triggers,  then create a new trigger using the 'after insert'.

Here is a simple example: http://boards.developerforce.com/t5/General-Development/APEX-Trigger-Simple-Field-Update-Using-a-for...

[Salesforce Partner · Accepted solution]

Well , you do not need code for this. Work flow should be good enough. 

Have a roll up field in Opportunity, that will be count of total Products, lets say field name is "Number of Products". 

Now have a workflow and fire only if that field is changed. 

Rule Criteria:  ISCHANGED(Number_of_Products__c) 

have a field update for this workflow. 

Just select the field to update and Specify new field value as: TODAY() 

hope this helps

SF Partner