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The number of List Items may not be fixed.
This is the case when the number of List Items is determined only when the message is created in the program.
In this case, create an SML file in the form of variable data Ln.

sml Example of file configuration
L n
SV

When creating a Send message, set the number of Lists in SetListItem () and use r When nMessage is received, the number of Lists is obtained by using GetListItem ().
nMessage transmission: Set the number of List items by using SetListItem () function. nReceive a message: Get the number of Lists using GetListItem ().