The function returns the name of a given column of specified structure (or structure definition) as a text. The column is given by its positional number (starting with 1). Expression of Hbj type returns an object attribute \HBJ.
%GetColName(SV.Structure\HBJ, 1) ; returns the value of "Text"
%GetColName(SV.Structure\HBJ, 2) ; returns the value of "Int"
%GetColName(SV.Structure\HBJ, 10) ; returns invalid value
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