There is not an intrinsic temp variable that I am aware of that is known as @blank.
Besides, if this is an HL/7 or X12 message, you should not see a field (or component or sub-component for that matter) with all spaces.
If however, this is something other than a structured message (such as FRL or VRL) then you will need to use a Tcl proc to check to see if the field is all spaces or if it contains spaces in any dimension.
Jim Kosloskey
email: jim.kosloskey@jim-kosloskey.com 29+ years Cloverleaf, 59 years IT - old fart.
What I’ve done in the past if a message comes in with a space in an HL7 field is to set a temp variable (in this case you could use @blank) to equal a space. Then you can use that @blank in your IF statement.
The error being reported is with the argument you are passing to the proc QDX_Tcl_SplitList. It would appear that it is a variable whose value resolves to “{“.
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