...
/GuiScripting/ProcessedScreen/Message[Id="VL"][Number="311"]/Parameter2/text()
There is also a way to log any custom variables in eCATT script by code block:
MESSAGE (MSG_1).
LOGMSG ( LOC_MESG_1 ).
ENDMESSAGE (MSG_2).
Where LOC_MESG_1 contains local variable as MSGV1:
To access it from IFTT the xpath expression should look like below:
//item[MSGID='ZZZ']/MSGV1/text()