Use
the system variable V[_transactionid]:
//
first time on this screen?
if not
V[_transactionid=&V[IW41_transactionid]
Set V[IW41_transactionid] "&V[_transactionid]
// Read additional data
Enter "/8" process="IW41_read_data.txt"
// You may terminate the script with a "Stop" command
// since the screen is not yet displayed
Stop
endif
//
main part of script
// ...
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