entry summary covers merchandise from more than one country of origin, record
the word "MULTI" in this block. In column 27, directly below the line
number, prefixed with the letter "O," indicate the ISO code
corresponding to each line item.
reporting number is preceded by an alpha character designating a special program
(i.e., NAFTA = “CA” or “MX”; GSP = “A”), that indicator is to be placed in
column 27, directly below the line number. The special program indicator (SPI)
should be right justified on the same line and immediately preceding the HTS
number to which it applies. If more than one HTS number is required for a line
item, place the SPI on the same line as the HTS number upon which the rate of
duty is based.