Specify the storage key of the buffers containing the message data by using the MSGSTGKEY parameter. If you specify the storage key of your buffers, the system transfers data from your buffers using a MOVE WITH KEY (MVCK) instruction. The operation is successful only if the buffers are in the storage key specified or if the buffers are not fetch protected.

If you omit the MSGSTGKEY parameter, the system transfers the data from your buffers regardless of their storage key.