CRM 2011 - Appointment plug-in in Pre-validation/Pre-creation stage with Create and Book message

If you want to registry a new plugin in CreateRequest message you have to consider that it can't be started.
Considering the following example :
You want subscribe, or register, an Appointment plug-in to the "pre-validation CreateRequest", in order to modify some appointment field.We would expect that it will run when the event occurs.

Now create a new appointment with start and end date 5 day after today.........surprise............!!!!!!! it doesn't run.
In this case the BookRequest message occurs and you have to subscrive, or register also your plug-in to BookRequest message, in order to triggering this event.

Nota:
I'm not sure but the BookRequest message should be substitute the information in the previous stage (CreateRequest in pre-validation) .

This shold be a big problem because if you want to use the Appointment plugin in ofline mode it doesn't work. Considering that the Book message work only in server mode!

In the following list you can find all appointment message :

Message	Description
AddRecurrenceRequest	Adds recurrence information to an existing appointment to make it a recurring appointment master.
AssignRequest	Assigns an appointment to another user or team.
AssociateRequest	Creates a link between a record and one or more records that participate in a relationship. You can also use theIOrganizationService.Associate method. For more information, seeActions on Entity Records. For a list of default relationships for this entity, see Appointment Entity Metadata.
BookRequest	Schedules or books an appointment.
CreateRequest	Creates an appointment. You can also call theIOrganizationService.Create method.
CreateExceptionRequest	Creates an exception for the recurring appointment instance,Appointment.InstanceTypeCode. For more information, seeCreate a Recurring Appointment Exception.
DeleteRequest	Deletes an appointment. You can also call theIOrganizationService.Delete method.
DisassociateRequest	Removes a link between a record and one or more records that participate in a relationship. You can also use theIOrganizationService.Disassociate method. For more information, see Actions on Entity Records. For a list of default relationships for this entity, see Appointment Entity Metadata.
GrantAccessRequest	Shares an appointment with another security principal (user or team).
InitializeFromRequest	Initializes a new record from an existing record provided that an attribute map is defined for the two entities. For more information, see Customize Entity and Attribute Mappings.
ModifyAccessRequest	Changes the access rights for an appointment previously shared with another security principal (user or team).
RescheduleRequest	Reschedules an appointment.
RetrieveDuplicatesRequest	Detects and retrieves duplicate records for the specified record, provided that duplicate detection is enabled and there are published duplicate detection rules for the entity. For more information, seeDetect Duplicate Data in Microsoft Dynamics CRM.
RetrieveRequest	Retrieves an appointmentYou can also call theIOrganizationService.Retrieve method.
RetrieveMultipleRequest	Retrieves a collection of appointments. You can also call theRetrieveMultiple method.
RetrievePrincipalAccessRequest	Retrieves the access that the specified security principal (user or team) has to an appointment.
RetrieveSharedPrincipalsAndAccessRequest	Retrieves the security principals (users or teams) that have access to an appointment, together with their access rights to the appointment.
RevokeAccessRequest	Removes all access to an appointment for the specified security principal (user or team).
SetStateRequest	Sets the state of an appointment. The possible values for this attribute are defined in the Appointment.State attribute. If you are using early bound types, you can use the AppointmentStateenumeration.
UpdateRequest	Updates an appointment. You can also call the Update method.
ValidateRequest	Validates that all the constraints of an appointment are met.

Nicola Grillo


Reference:
Microsoft Dynamics CRM 2011 SDK