Journal Name Creation on Event Handler

You could probably do that by turning on the submit/approve process on the WF, use the event handler (FinalizeSubmitJournal) to check the journal name and send an email to either the approver if it passes or the creator if it fails. However, it wouldn't prevent the approval of a journal with a bad name as long as it meets the journal template data requirements (e.g. balanced).

The GolfStream application has examples of the FinalizeSubmitjournal event plus sending an email as chul​ recommends. The CPM BluePrint marketplace application also uses a JournalsEventHandler and that displays messages if certain criteria are not met. Here is the CPM BluePrint event handler:

Imports System
Imports System.Data
Imports System.Data.Common
Imports System.IO
Imports System.Collections.Generic
Imports System.Globalization
Imports System.Linq
Imports Microsoft.VisualBasic
Imports System.Windows.Forms
Imports OneStream.Shared.Common
Imports OneStream.Shared.Wcf
Imports OneStream.Shared.Engine
Imports OneStream.Shared.Database
Imports OneStream.Stage.Engine
Imports OneStream.Stage.Database
Imports OneStream.Finance.Engine
Imports OneStream.Finance.Database

Namespace OneStream.BusinessRule.JournalsEventHandler.JournalsEventHandler
	Public Class MainClass
		'------------------------------------------------------------------------------------------------------------
		'Reference Code: 	JournalEventHandler 
		'
		'Description:		Event handler to ensure process/approve/post are done by different users to enable
		'					seggregation of duties
		'					
		'Usage:				Executes when a Journal action is run and fires this business rule. 
		'				
		'Created By:		OneStream Software
		'------------------------------------------------------------------------------------------------------------		
		Public Function Main(ByVal si As SessionInfo, ByVal globals As BRGlobals, ByVal api As Object, ByVal args As JournalsEventHandlerArgs) As Object
			Try
				'on/off switch to control logic from running
				Dim processEvents As Boolean = False
				Dim returnValue As Object = args.DefaultReturnValue
				args.UseReturnValueFromBusinessRule = False
				args.Cancel = False
				
				'Evaluate the operation type in order to determine which subroutine to process
				Select Case args.OperationName
					Case Is = BREventOperationType.Journals.ApproveJournal
						If processEvents Then
							'APPROVED - Check approver against submitter
							OSB_HandleApproveJournal(si, globals, api, args)		
						End If
					Case Is = BREventOperationType.Journals.PostJournal
						If processEvents Then
							'POST - Check poster against submitter & approver
							OSB_HandlePostJournal(si, globals, api, args)
						End If
				End Select

				Return returnValue
			Catch ex As Exception
				Throw ErrorHandler.LogWrite(si, New XFException(si, ex))
			End Try
		End Function
		
#Region "Finalize Approve Helpers"

	Private Sub OSB_HandleApproveJournal(ByVal si As SessionInfo, ByVal globals As BRGlobals, ByVal api As Object, ByVal args As JournalsEventHandlerArgs)
		'------------------------------------------------------------------------------------------------------------
		'Reference Code: 	XFR_HandleFinalizeApproveJournal 
		'
		'Description:		Display a message to the user to not allow journal approval if they were the submitter.
		'
		'Usage:				Used to alert the journal approver that they cannot approve a journal if they were the submitter. 
		'
		'Created By:		OneStream Software
		'------------------------------------------------------------------------------------------------------------
		Try
			'APPROVED - Check approver against submitter
			If (args.IsBeforeEvent = False) Then
				Dim journalID As JournalEx = DirectCast(args.Inputs(1), JournalEx)
				If Not journalID Is Nothing Then						
					'Make sure that the journal is being approved by someone other than the submitter before we send an email
					If (JournalID.Header.Header.SubmittedUserID = si.AuthToken.UserUniqueID) Then
						Throw New XFException(si, New Exception("Error: You cannot quick post or approve a journal you submitted."))
					End If
				End If	
			End If
		Catch ex As Exception
			Throw ErrorHandler.LogWrite(si, New XFException(si, ex))
		End Try
	End Sub

#End Region

#Region "Finalize Post Helpers"

	Private Sub OSB_HandlePostJournal(ByVal si As SessionInfo, ByVal globals As BRGlobals, ByVal api As Object, ByVal args As JournalsEventHandlerArgs)
		'------------------------------------------------------------------------------------------------------------
		'Reference Code: 	XFR_HandleFinalizePostJournal 
		'
		'Description:		Display a message to the user to not allow journal posting if they were the submitter and/or approver.
		'
		'Usage:				Used to alert the journal poster that they cannot post a journal if they were the submitter/approver. 
		'
		'Created By:		OneStream Software
		'------------------------------------------------------------------------------------------------------------
		Try
			'APPROVED - Check poster against submitter/approver
			If (args.IsBeforeEvent = False) Then
				Dim journalID As JournalEx = DirectCast(args.Inputs(1), JournalEx)						
				If Not journalID Is Nothing Then						
					'Make sure that the journal is being posted by someone other than the submitter before we send an email
					If ((JournalID.Header.Header.ApprovedUserID = si.AuthToken.UserUniqueID)) Then
						Throw New XFException(si, New Exception("Error: You cannot post a journal you submitted or approved."))								
					End If
				End If
			End If
		Catch ex As Exception
			Throw ErrorHandler.LogWrite(si, New XFException(si, ex))
		End Try
	End Sub

#End Region
		
	End Class
End Namespace