trigger UpdateStandardPrices on Product2 (after insert, after update) {
    
    //Update the Standard price in all currencies from the Cost price on the Product. Cost Price is always in SEK
    //Create a PriceBookEntry if it's a new Product
    
    System.Debug('USP TRIGGER');
    
    //This trigger will cause recursion if it's not stopped. 
    //The TriggerMonitor class is static, and remains for the lifetime of the insert/update
    //This prevents recursion.
    string TriggerName = 'UpdateStandardPrices';
    if (!TriggerMonitor.ExecutedTriggers.contains(TriggerName))
    {       
        TriggerMonitor.ExecutedTriggers.add(TriggerName);
        
        // GET ALL DATA //
        Id PriceBookId = [SELECT Id From Pricebook2 WHERE IsStandard=TRUE].Id; 															//Get the ID of the Standard Price Boook
        list<CurrencyType> ActiveCurrencies = [SELECT ISOCode, ConversionRate FROM CurrencyType WHERE IsActive=TRUE]; 					//Get a list of all active currencies
        list<Product2> Products = new List<Product2>([SELECT Id, BP_Cost__c, CurrencyIsoCode FROM Product2 WHERE Id in :Trigger.new]);	//Get a list of all new entries
        list<PricebookEntry> resultList = new list<PricebookEntry>();																	//List to populate and update
        
        for( Product2 product : Products)
        {
            
            list<PricebookEntry> loopList = new list<PricebookEntry>([Select Id, CurrencyISOCode FROM PricebookEntry WHERE PricebookEntry.Product2Id =: product.Id]); //Get a list of all entries in the Standard Price Book for the product id
            
            for(CurrencyType c : ActiveCurrencies)
            {
                
                integer currencyExists = 0;					//Reset the currency exists flag
                PricebookEntry price = new PricebookEntry();
                
                for(PricebookEntry l : loopList)		
                {											//Is there already an entry in the currency
                    if(l.CurrencyIsoCode == c.IsoCode)
                        currencyExists = 1;
                }
                
                
                if(currencyExists == 0)
                {											//Does not exist in this currency: Insert new StandardPrice
                    
                    price.UnitPrice = product.BP_Cost__c * c.ConversionRate; 
                    price.Product2Id = product.Id;
                    price.CurrencyISOCode = c.IsoCode;
                    price.Pricebook2Id = PriceBookId;
                    price.IsActive = TRUE;
                    insert price;
                }
                else
                {											//Exist in this currency: Update with new StandardPrice
                    for(PricebookEntry l : loopList)		
                    {										//Loop through to find the unique Id for the PricebookEntry
                        
                        if(l.CurrencyIsoCode == c.IsoCode)
                            price.Id = l.Id;
                    }
                    
                    price.UnitPrice = product.BP_Cost__c * c.ConversionRate;
                    price.IsActive = TRUE;
                    resultList.add(price);
                }
            }
            
        }
        update resultList;
    }
}