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Messages in ABAP Release 7.51 ITOC
ABAP_MODIFICATION_NN Implicit Message Type in IF_T100_DYN_MSG >>
If the object reference variable oref> in the variant MESSAGE oref>> of the statement MESSAGE>> (used to send a message) points to an object that includes the system interface IF_T100_DYN_MSG>>, the addition TYPE> can be omitted. The message type from the interface attribute MSGTY> of the object is then used implicitly.