ApprovalWorkflow.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using PX.Common;
using PX.Data;
using PX.Data.EP;
using PX.Objects;
using PX.Objects.RQ;
using PX.Objects.PO;
using PX.Objects.EP;
using System.Reflection;

namespace PX.Objects.PO
{
	public class MyApprovalAutomation
		: EPApprovalAutomation<POOrder, POOrder.approved, POOrder.rejected, POOrder.hold, POSetupApproval> 
	{
		public MyApprovalAutomation(PXGraph graph, Delegate @delegate)
			: base(graph, @delegate)
		{
		}

		public MyApprovalAutomation(PXGraph graph)
			: base(graph)
		{
		}

		public override void Reset(POOrder source)
		{
			base.Reset(source);
		}
		protected override void Approved_FieldVerifying(PXCache cache, PXFieldVerifyingEventArgs e)
		{
			try
			{
				base.Approved_FieldVerifying(cache, e);
			}
			catch
			{
				e.NewValue = false;
				throw;
			}
		}		
	}

	public class POOrderEntry_Extension : PXGraphExtension<POOrderEntry>
	{
		#region DataViews
		[PXViewName(Messages.Approval)]
		public MyApprovalAutomation Approval;
		#endregion

		#region Initialise
		public override void Initialize()
		{
			base.Initialize();

			MethodInfo mi = null;
			Type type = Base.Approval.GetType();
			
			//Removing events from base ApprovalAutomation view.
			mi = type.GetMethod("Approved_FieldUpdated", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
			Base.FieldUpdated.RemoveHandler(BqlCommand.GetItemType(typeof(POOrder.approved)), typeof(POOrder.approved).Name,
				(PXFieldUpdated)mi.CreateDelegate(typeof(PXFieldUpdated), Base.Approval));

			mi = type.GetMethod("Approved_FieldVerifying", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
			Base.FieldVerifying.RemoveHandler(BqlCommand.GetItemType(typeof(POOrder.approved)), typeof(POOrder.approved).Name,
				(PXFieldVerifying) mi.CreateDelegate(typeof(PXFieldVerifying), Base.Approval));

			mi = type.GetMethod("Approved_FieldDefaulting", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
			Base.FieldDefaulting.RemoveHandler(BqlCommand.GetItemType(typeof(POOrder.approved)), typeof(POOrder.approved).Name,
				(PXFieldDefaulting) mi.CreateDelegate(typeof(PXFieldDefaulting), Base.Approval));

			mi = type.GetMethod("Rejected_FieldUpdated", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
			Base.FieldUpdated.RemoveHandler(BqlCommand.GetItemType(typeof(POOrder.rejected)), typeof(POOrder.rejected).Name,
				(PXFieldUpdated) mi.CreateDelegate(typeof(PXFieldUpdated), Base.Approval));

			mi = type.GetMethod("Rejected_FieldVerifying", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
			Base.FieldVerifying.RemoveHandler(BqlCommand.GetItemType(typeof(POOrder.rejected)), typeof(POOrder.rejected).Name,
				(PXFieldVerifying) mi.CreateDelegate(typeof(PXFieldVerifying), Base.Approval));

			mi = type.GetMethod("Hold_FieldDefaulting", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
			Base.FieldDefaulting.RemoveHandler(BqlCommand.GetItemType(typeof(POOrder.hold)), typeof(POOrder.hold).Name,
				(PXFieldDefaulting) mi.CreateDelegate(typeof(PXFieldDefaulting), Base.Approval));

			mi = type.GetMethod("RowUpdated", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
			Base.RowUpdated.RemoveHandler(typeof(POOrder), (PXRowUpdated) mi.CreateDelegate(typeof(PXRowUpdated), Base.Approval));

			mi = type.GetMethod("OnPersisted", System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.NonPublic);
			Base.RowPersisted.RemoveHandler(typeof(POOrder), (PXRowPersisted)mi.CreateDelegate(typeof(PXRowPersisted), Base.Approval));
		}
		#endregion
	}
}