Input Standards | |||
| Optional/Optional | |||
| 1st Indicator Undefined | |||
| Undefined | |||
| 2nd Indicator Undefined | |||
| Undefined | |||
| Subfields (R=Repeatable NR=Nonrepeatable) | Input Standards | ||
| ‡a | System control number (NR) | Mandatory/Mandatory | |
| ‡b | Institution symbol (R) | Required if applicable/Required if applicable | |
| ‡z | Canceled/invalid system control number (R) | Optional/Optional | |