The selection field for the Number range type parameter refers to the dynamic enumeration Number range type and supports a search function as shown to the right.

Dynamische Aufzählungsfilter for the Number range type applicable in the context of the configuration can limit the selection options. Such restrictions have no influence on the runtime behaviour.

In the example on the right, the sequence number (#58) appears and is followed by the letter 'D' (DELETE) and the internal class name for the deleted object of the guest user (GuestUser) type.

An event handler is configured as shown on the right:

• Triggering events are defined as 'Delete', 'Create', 'Update' (see Common action event).
  
  

• The Validating rule performs a Typprüfung on the overall class 'Interface > Users' so that event actions are performed only for Users and Guest users.
  
  

• At runtime, the E-Mail event action receives the account to which the triggering event refers as input value. Its data is therefore also available for the value resolvers defined in the configuration:
  
  

  • In the Subject parameter, this concerns the Number range value value resolver, which refers to the specially created Number range type 'Account Transaction' (ACCOUNT_TRANSACTION) as shown in the image.
    
    

  • The same data could be used further on for configurations for the Mail body builder or for defining an attachment for the mail. Details of this are not relevant in the present example.

The Subject for the e-mail is completely defined here by configuring a number range with the Number range type 'Account Transaction'. This contains 5 number parts as shown in the screenshot below:

• The first is of the Dynamic (Number part) type and defines an incrementally ascending sequence number with a value range of 1 – 999,999, represented with leading zeros so that e-mails can be sorted by Subject, if necessary, to track 'Account Transactions' chronologically.
  
  

• This is followed by a number part of the Fixed (Number part) type, which inserts an underscore as a separator.
  
  

• This is followed by a number part of the Wert über Resolver (Nummernteil) type with the description 'Event', which sets the identification letter 'C', 'U' or 'D'.
  This enables a concatenation of the Triggering event value resolver, which is not visible in the image, with a Substring value resolver, which only takes the first character from the internal name of the event.
  
  

• This is followed by a number part of the Fixed (Number part) type, which inserts an underscore as a separator.
  
  

• The final part is another number part of the Wert über Resolver (Nummernteil) type, which (see image) reads the internal class name from the variable entityClass and replaces all text characters up to the last full stop with nothing via the concatenated Replace text value resolver (i.e. 'removes' the namespace part of the class name). What remains is the internal name of the class (here: 'User' or 'GuestUser'), which should suffice for the Subject.