title: Strange behavior CRM 2011 plugin
body: <p>I have registered a plugin for our quote products. The plugin worked well in our test environment. I have tested it lots of times. Then registered the plugin in the main server. However, the below scenario occurs:
  When I create or update the quote products first the quote product form greys out:</p>
  
  <p><img src="https://i.stack.imgur.com/bikyD.png" alt="enter image description here"></p>
  
  <p>After I click on the quote form the error appears. No log files are available (as you see). I debugged the plugin, but there is no error also. After I click the OK, the error disappears and the required business takes place on the quote product (for tax field). Means that the code of plugin has no errors and does its job well. The code is as:</p>
  
  <pre><code>using System;
  using System.Diagnostics;
  using System.Linq;
  using System.ServiceModel;
  using Microsoft.Xrm.Sdk;
  using Xrm;
  using System.Collections.Generic;
  using Microsoft.Xrm.Sdk.Deployment;
  
  public class Plugin : IPlugin
  {
      public void Execute(IServiceProvider serviceProvider)
      {
          IPluginExecutionContext context = (IPluginExecutionContext)
          serviceProvider.GetService(typeof(IPluginExecutionContext));
          Entity entity;
          if (context.InputParameters.Contains("Target") &amp;&amp;
          context.InputParameters["Target"] is Entity)
          {
              entity = (Entity)context.InputParameters["Target"];
              if (entity.LogicalName != "quotedetail") { return; }
          }
          else
          {
              return;
          }
          try
          {
              IOrganizationServiceFactory serviceFactory =
                  (IOrganizationServiceFactory)serviceProvider.GetService(
              typeof(IOrganizationServiceFactory));
              IOrganizationService service =
              serviceFactory.CreateOrganizationService(context.UserId);
              if (context.MessageName == "Create")
              {
                  Entity QuoteProduct = (Entity)context.InputParameters["Target"];
                  Guid QPID = QuoteProduct.Id;
                  TaxCreator(service, QPID);
              }
              if (context.MessageName == "Update" &amp;&amp; context.Depth &lt; 3)
              {
                  Entity QuoteProduct = (Entity)context.PostEntityImages["Target"];
                  Guid QPID = QuoteProduct.Id;
                  TaxUpdater(service, QPID);
              }
          }
          catch (FaultException&lt;OrganizationServiceFault&gt; ex)
          {
              throw new InvalidPluginExecutionException(
              "An error occurred in the plug-in.", ex);
          }
      }
      private static void TaxCreator(IOrganizationService service, Guid QPID)
      {
          using (var crm = new XrmServiceContext(service))
          {
              var QuoteProduct = crm.QuoteDetailSet.Where(c =&gt; c.QuoteDetailId == QPID).First();
              var SaleSetting = crm.new_salessettingSet.Where(c =&gt; c.statecode == 0).First();
              double TaxPercent = (Convert.ToDouble(SaleSetting.new_TaxPercent) / 100);
              if (QuoteProduct.IsPriceOverridden == false)
              {
                  decimal Tax = (decimal)Convert.ToDecimal(Convert.ToDouble(QuoteProduct.BaseAmount - QuoteProduct.ManualDiscountAmount.GetValueOrDefault()) * TaxPercent);
                  decimal PricePerUnit = (decimal)(QuoteProduct.PricePerUnit.GetValueOrDefault() - QuoteProduct.VolumeDiscountAmount.GetValueOrDefault());
                  crm.UpdateObject(QuoteProduct);
                  crm.SaveChanges();
                  QuoteProduct.Attributes["tax"] = new Money(Tax);
                  QuoteProduct.Attributes["new_result"] = new Money(PricePerUnit);
                  crm.UpdateObject(QuoteProduct);
                  crm.SaveChanges();
              }
          }
      }
      private static void TaxUpdater(IOrganizationService service, Guid QPID)
      {
          using (var crm = new XrmServiceContext(service))
          {
              var QuoteProduct = crm.QuoteDetailSet.Where(c =&gt; c.QuoteDetailId == QPID).First();
              var SaleSetting = crm.new_salessettingSet.Where(c =&gt; c.statecode == 0).First();
              double TaxPercent = (Convert.ToDouble(SaleSetting.new_TaxPercent) / 100);
              if (QuoteProduct.IsPriceOverridden == false)
              {
                  decimal Tax = (decimal)Convert.ToDecimal(Convert.ToDouble(QuoteProduct.BaseAmount - QuoteProduct.ManualDiscountAmount.GetValueOrDefault()) * TaxPercent);
                  decimal PricePerUnit = (decimal)(QuoteProduct.PricePerUnit.GetValueOrDefault() - QuoteProduct.VolumeDiscountAmount.GetValueOrDefault());
                  crm.UpdateObject(QuoteProduct);
                  crm.SaveChanges();
                  QuoteProduct.Attributes["tax"] = new Money(Tax);
                  QuoteProduct.Attributes["new_result"] = new Money(PricePerUnit);
                  crm.UpdateObject(QuoteProduct);
                  crm.SaveChanges();
              }
          }
      }
  }
  </code></pre>
  
  <p>I also checked the event viewer on the server for the errors, and no result!
  I have registered my plugin on create and update of the quote product.
  Any help is greatly appreciated.</p>