Hi I'm trying to create a trigger to do the following.

On Line Item Revision object if a record is created I want to query the Line item Revision Parent Object and see if there is a Parent that exists with the matching WF_ID__c value, and if not I want to create a new parent.

On Line Item Revision object if a record is updated I want to query the Line item Revision Parent Object and see if there is a Parent that exists with the matching WF_ID__c value, I want to update the trigger__c field by incrementing it by 1.

I can get the first part to work in that i can get it to create a parent, but when trying to update an existing parent I get the following error with my code "Initial term of field expression must be a concrete SObject:ID"

If anyone can assist in helping understand what I'm doing wrong that would be greatly appreciated. Thank you.

trigger Create_Line_Item_Parent_On_Line_Item_Revisions on Line_Item_Revisions__c (before update,after insert, after update, after delete, after undelete) {


// create a set of all the unique line item revision records based on WF ID
   
List<string> LIRevisions = new List<string>();

       for (Line_Item_Revisions__c lir : Trigger.new)
  {
         
           LIRevisions.add(lir.wf_id__c); 

       }
List <Line_Item_Revision_Parent__c > LineItemParentstoCreate = new list <Line_Item_Revision_Parent__c> ();
List <Line_Item_Revision_Parent__c > LineItemParentstoUpdate = new list <Line_Item_Revision_Parent__c> ();
List <Line_Item_Revision_Parent__c > LineItemParentList=[Select WF_ID__c, id, Trigger__c from Line_Item_Revision_Parent__c Where WF_ID__c =:LIRevisions ];
List <OpportunityLineItem > IOLineItem=[Select WF_ID__c, id from OpportunityLineItem where WF_ID__c =:LIRevisions ];



Map<String,Id> LIRPMap = new Map <String,ID> ();
for (Line_Item_Revision_Parent__c LIP:LineItemParentList)
{
  LIRPMAP.put(LIP.WF_ID__c,LIP.id);

}

Map<String,Id> IOLineItemMap = new Map <String,ID> ();
for (OpportunityLineItem OLI:IOLineItem)
{
  IOLineItemMap.put(OLI.WF_ID__c,OLI.id);
}



for (Line_Item_Revisions__c LIRadd : Trigger.new)  {


if (LIRPMAP.isEmpty () )
   {
    Line_Item_Revision_Parent__c LIP2 = new Line_Item_Revision_Parent__c ();
  
    LIP2.WF_ID__c= LIRadd.WF_ID__c;
    LIP2.IO_Line_Item_Parent__c=IOLineItemMap.get(LIP2.WF_ID__c);
    LineItemParentstoCreate.add(LIP2);
  
                 
   }
  
   if(!LIRPMAP.isEmpty())
 
   {
    Line_Item_Revision_Parent__c LIP3 =LIRPMAP.get(LIRADD.WF_ID__c).id;
    LIP3.Trigger__c= LIRPMAP.get(LIP3.WF_ID__c)trigger__c+1;
       LineItemParentstoUpdate.add(LIP3);
   }
   }



try{
update LineItemParentstoUpdate;
insert LineItemParentstoCreate;
}catch (System.Dmlexception e) {

}
}