Question
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Mapping: In my formula, I am using a "program calculated variable"
(for example, the generic format of this variable might be |VC:CHAR-VAR|).
I am sure that there is a value associated with that variable but 
somehow, I am generating a blank for that outbound position.  Why is that?

Answer
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If you spell the variable (e.g., the variable name defined as CHAR-VAR in
the question above) incorrectly, the value would obviously not be
considered to be predefined for your usage.  For example, |VC:num-box| is
not the same as |VC:num-boxes|.  The values assigned to a variable must be
done and defined in the program which is controlling the generation of EDI
data for the document that you are generating.  In other words, variables
may be available for usage in one document type but not for another and
spelling must be correct.  If the variable is not set up (predefined), then
the variable will be generated as undefined (blank, zero, ?, etc.) for the
position in question.  It is important to note that you will not get an
error when the variable is not predefined.  Verify the documentation to see
what calculated value variables are available to you, the document
(transaction set) associated with that variable, the data type for proper
formula calculation as well as the correct spelling.  Moreover, remember
that program calculated variables are only used for outbound (i.e.
generated) data.