The function returns a column count of the structured variable (or structure
definition) as a number. HBJ expression returns an object attribute
\HBJ.
Example
%GetColsNr(SD.Struktura\HBJ) ; it returns a column count
%GetColsNr(SV.Struktura\HBJ) ; it returns a column count
%GetColsNr(Sec\HBJ) ; it returns an invalid value
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