Updating Products In a Sales Order

I am trying to using Zoho flow to create an automation to update all products on a sales order with a predefined project_id.

My inputs to the customer function is Sales order ID and Project ID.

My code is this:

void salesorderupdateprojectstatus(string SalesOrder_ID, string Project_ID)
{
info "Sales Order ID " + SalesOrder_ID;
info "Project Order ID " + Project_ID;
SalesOrder = zoho.books.getRecordsByID("salesorders","XXXXXXX",SalesOrder_ID,"zohobooksconnection");
SalesOrderJSON = SalesOrder.toJSONList();
// info SalesOrderJSON;
ProductList = SalesOrderJSON.getJSON("salesorder").getJSON("line_items");
// info ProductList;
projectmap = Map();
projectmap.put("project_id",Project_ID);
lineitemmap = Map();
lineitemmap.put("line_items",projectmap);
salesordermap = Map();
salesordermap.put("salesorder",lineitemmap);
for each item in ProductList
{
SalesOrderUpdate = zoho.books.updateRecord("salesorders","XXXXXXX",SalesOrder_ID,salesordermap,"zohobooksconnection");
}
info SalesOrderUpdate;
}