Stage = Rejected,,, Rejection Reason is RequiredAND( OR( ISPICKVAL( StageName , "Rejected")) , ISBLANK( Rejection_Reason__c ) )

ExpirationDate > TODAY() + 10

public class sample1 {
   public String[] getStrings() {
        return new String[]{'A','B','C','D','E','F','G','H',        'I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W',        'X','Y','Z','Other','ALL'};
    }
}************************************************<apex:page controller="sample1"> <apex:repeat value="{!strings}" var="string" id="theRepeat">
        <apex:outputText value="{!string}" id="theValue"/> |
    </apex:repeat></apex:page>

Page Navigation Methods:
For a VisualForce Page:PageReference pageRef = Page.VFPageName
For a SalesForce(Possibly non-VisualForce) Page:PageReference pageRef = new PageReference('partialURL')
partialURL = https://salesforceserver.salesforce.com
For a non-Salesforce Website:PageReference pageRef = new PageReference('fullURL')

Hi,

I have a custom object Product_Serial__c which has  a lookup field to another object Product_inventory__c.

The product_inventory__c has a lookup to Product.
The product serial record also has a lookup to product

Now when a user creates a new Product Serial record ,
i created a trigger on the Product serial that updates the product value from the product_inventory which the user enters to create a record.

But this update is not happening.Please help.

Trigger updprod on Product_serial__c(after insert)

{

Set<Id> ids = trigger.newmap.keySet();

List<Product_serial__c> pser=[select product_inventory__c,product__c,Product_Inventory__r.Product__r.Id from  product_serial__c where id IN :ids];

For(Product_serial__c psers:pser)

{

 psers.product__c=psers.Product_Inventory__r.Product__r.Id;

update psers;

}

}