Registering plugins for event on many-to-many entities

I found that from the box MS CRM 4.0 are not supported the events on many-to-many relationship entities(bridge entities). But Aaron Elder has hack it.

All you need is just register it at AssociateEntities or DiassociateEntities event with empty Primary and Secondary Entity fields.

-- ============================================================================
-- Enable Associate and Disassociate Plug-in Events Script v1.0
-- ----------------------------------------------------------------------------
-- (c) 2009 Aaron Elder
-- ============================================================================
-- DISCLAIMER:
-- This script is provided "AS IS" with no warranties, and confers no rights.
-- ============================================================================
-- While this is obviously "unsupported", I think the fact that these events
-- are not available is a bug and hopefully it will be fixed in a rollup.
-- ============================================================================

USE AscentiumCrmDev_MSCRM
GO

-- Find the deployments SDK Filter ID for the
-- Associate and Disassociate Entity SDK Messages
DECLARE @DisassociateEntitiesFilterId uniqueidentifier
DECLARE @AssociateEntitiesFilterId uniqueidentifier
SET @DisassociateEntitiesFilterId = (SELECT SdkMessageId FROM SdkMessageBase WHERE [Name] = 'DisassociateEntities')
SET @AssociateEntitiesFilterId = (SELECT SdkMessageId FROM SdkMessageBase WHERE [Name] = 'AssociateEntities')

-- Enable the Associate and Disassociate Filters to be valid for custom processing
-- Custom Processing means "you register plug-ins against it"
-- Note: We only do this for the "generic" (OTC == 0) case, just to be safer
UPDATE SdkMessageFilterBase SET IsCustomProcessingStepAllowed = 1
       WHERE SdkMessageId = @DisassociateEntitiesFilterId AND PrimaryObjectTypeCode = 0


UPDATE SdkMessageFilterBase SET IsCustomProcessingStepAllowed = 1
       WHERE SdkMessageId = @AssociateEntitiesFilterId AND PrimaryObjectTypeCode = 0

(C)
http://consulting.ascentium.com/blog/crm/Post533.aspx