the sender field characteristics of at least one sender field specification specify that a message field contains a constant value;

the receiver field characteristics of at least one receiver field specification also specifies that the message field contains the constant value;

creating, by the message sending device, an application message according to the sender message model further comprises creating the application message without the message field containing the constant value; and

administering, by the message receiving device, the application message in dependence upon the comparison further comprises retrieving the constant value from the receiver message model if the receiver version number matches the sender version number.