Check HS classification parameter
     
    
    Usage
    check_clCode(commodity_classification)
 
    
    Arguments
    - commodity_classification
- A character string specifying the HS classification code. Must be "HS". 
 
    
    Value
    
A character string specifying the HS classification code.
     
    
    Examples
    if (FALSE) { # interactive()
untrader:::check_clCode("HS") # returns "HS"
untrader:::check_clCode("ISIC") # throws an error because "ISIC" is not a valid classification code
}