Hi Everyone, 

I have recently scheduled an apex class to run via the Schedule Apex interface that will create new records in a custom object called "Oppty_Line_Item_History" when certain criteria is met on the standard object "OpportunityLineItem". The class works via trigger (although it does a weird duplicate thing because of workflows) but it does not seem to run when I schedule it it to run every night.  I also can't even figure out WHERE I can see what went wrong. 

Here is the class I want to run:

public class OpptyLineItemHISTORY{

public void method1(List<OpportunityLineItem> changes){
//List to hold LineItemHistory
List <Oppty_Line_Item_History__c> insertHIST = new List <Oppty_Line_Item_History__c>();

for (OpportunityLineItem o: changes){

if (o.priorvalues__c=='Yes'&& o.LastModifiedDate==date.today())
{
changes.add(o);

Oppty_Line_Item_History__c IH = new Oppty_Line_Item_History__c();

IH.Action_Date__c=o.lastmodifieddate;
IH.Action__c = 'Product Updated';
IH.Oppty_Line_Item_id__c = o.id;
IH.Opportunity__c = o.OpportunityId;
IH.Product_Name__c=o.Product_Name_in_TEXT__c;
IH.Oppty__c=o.opptytrigger__c;
IH.Line_Item__c=o.Line_Item_Id__c;
IH.Product_Family__c = o.Product_Family__c;
IH.Site__c=o.Site__c;
IH.fixed_Variable__c=o.fixed_Variable__c;
IH.discount__c=o.discount__c;

IH.Modification__c=o.Modification__c;
IH.Modification_Type__c= o.Modification_Type__c;
IH.Quantity__c=o.Quantity;
IH.Sales_Price__c = o.UnitPrice;
IH.Total_Price__c = o.Total__c;

insertHIST.add(IH);

insert IH;

}

//once loop is done, you need to insert new records in SF
//DML operations might cause an error, so you need to catch it with try/catch block.
} //once loop is done, you need to insert new records in SF
// dml operations might cause an error, so you need to catch it with try/catch block.

insert insertHIST;

}
}

Here is my schedulable class:

global class ScheduleLineItemHistory implements Schedulable {
global void execute (SchedulableContext SC) {

lineitemhistoryHELPER HELPER = new lineitemhistoryHELPER();

HELPER.CreateHistoryasNeeded();

}
}