Updating a location on a cashsale with assembly items

I have a need to update the location of a cash sale, but I'm running into issues. The line items for the cash sale are assembly items, and therefore have their own locations. When I try updating just the cash sale body location, I get an error telling me I need to update the inventorydetail for item 1.

Here is the current script with the attempt to update the inventory detail. This just throws UNEXPECTED_ERROR. Any insight would be greatly appreciated.

record = nlapiLoadRecord("cashsale", id);  if (!record) {  throw new Error('An Record with this ID does not exists');  }    record.setFieldValue("location", 24);    var totalLine = record.getLineItemCount("item");    for (var index = 1; index <= totalLine; index++) {  record.selectLineItem("item", index);    var subrecord= record.editCurrentLineItemSubrecord("item", "inventorydetail");  if (subrecord){  subrecord.setFieldValue("location",24);  subrecord.commit();  }  record.commitLineItem("item");  }    var returnValue = nlapiSubmitRecord(record);