CustomInfo.cs

public PXAction<MultiPayment> Release;
[PXProcessButton]
[PXUIField(DisplayName = "Release")]
protected virtual void release()
{
	this.Actions.PressSave();

	PXLongOperation.StartOperation(this, delegate ()
	{
		CreatePayment(row);
	});
}

public static void CreatePayment(MultiPayment multi)
{
	ReleaseInfo info = new ReleaseInfo();

  //....
  try
  {
    //Do all processing
  }
  catch(Exception ex)
  {
    info.details[line.Key] = ex;
  }
  //....

	PXLongOperation.SetCustomInfo(info);
}
		
public class ReleaseInfo : IPXCustomInfo
{
	public Dictionary<string, Exception> details = new Dictionary<string, Exception>();
	public void Complete(PXLongRunStatus status, PXGraph graph)
	{
		if (status == PXLongRunStatus.Aborted && graph is MultiPaymentEntry)
		{
			((MultiPaymentEntry)graph).RowSelected.AddHandler<MultiPaymentLine>((sender, e) =>
			{
				MultiPaymentLine line = e.Row as MultiPaymentLine;
				if (line != null)
				{
					if (details.ContainsKey(line.Key))
					{
						Exception ex = details[line.Key];
						if (ex != null) sender.RaiseExceptionHandling<MultiPaymentLine.key>(line, line.Key,
							 new PXSetPropertyException(ex.Message, PXErrorLevel.RowError));
					}
				}
			});
		}
	}
}