Identifies class of alternative SecurityID (48)
Valid values:
| '1' | CUSIP |
| '2' | SEDOL |
| '3' | QUIK |
| '4' | ISIN number |
| '5' | RIC code |
| '6' | ISO Currency Code |
| '7' | ISO Country Code |
| '100' ... '10000000000' |
Used in: