| MBA | Character (4) | MBA code of reporting MBA | 1 |
| Report type | Character (1) | I for Inventory Change Report | 2 |
| Report date | DDMMYYYY | Date on which the report was completed | 3 |
| Report number | Number (8) | Sequential number, no gaps | 4 |
| Line count | Number (8) | Total number of lines reported | 5 |
| Start report | DDMMYYYY | Date of first day in reporting period | 6 |
| End report | DDMMYYYY | Date of last day in reporting period | 7 |
| Reporting person | Character (30) | Name of person responsible for the report | 8 |
| Transaction ID | Number (8) | Sequential number | 9 |
| IC code | Character (2) | Type of inventory change | 10 |
| Batch | Character (20) | Unique identifier for a batch of qualifying nuclear material | 11 |
| KMP | Character (1) | Key measurement point | 12 |
| Measurement | Character (1) | Measurement code | 13 |
| Material form | Character (2) | Material form code | 14 |
| Materialcontainer | Character (1) | Material container code | 15 |
| Material state | Character (1) | Material state code | 16 |
| MBA from | Character (4) | MBA code of shipping MBA (for IC codes RD and RF only) | 17 |
| MBA to | Character (4) | MBA code of receiving MBA (for IC codes SD and SF only) | 18 |
| Previous batch | Character (20) | Name of previous batch (for IC code RB only) | 19 |
| Original date | DDMMYYYY | Accounting date of the line to be corrected (always of first line in correction chain) | 20 |
| PIT date | DDMMYYYY | Date of physical inventory taking (PIT) to which MF adjustment refers (use with IC code MF only) | 21 |
| Line number | Number (8) | Sequential number, no gaps | 22 |
| Accounting date | DDMMYYYY | Date on which the inventory change occurred or became known | 23 |
| Items | Number (6) | Number of items | 24 |
| Element category | Character (1) | Category of qualifying nuclear material | 25 |
| Element weight | Number (24.3) | Element weight | 26 |
| Isotope | Character (1) | G for U-235, K for U-233, J for a mixture of U-235 and U-233 | 27 |
| Fissile weight | Number (24.3) | Weight of fissile isotope | 28 |
| Isotopic composition | Character (130) | U, Pu isotopic weight (only if agreed in particular safeguard provisions) | 29 |
| Obligation | Character (2) | Safeguards obligation | 30 |
| Previous category | Character (1) | Previous category of qualifying nuclear material (use for IC codes CB, CC and CE only) | 31 |
| Previous obligation | Character (2) | Previous obligation (use for IC codes BR, CR, PR and SR only) | 32 |
| Document | Character (70) | Operator-defined reference to supporting documents | 33 |
| Container ID | Character (20) | Operator-defined identifier for the container | 34 |
| Correction | Character (1) | D for deletions, A for additions forming part of a deletion/addition pair, L for late lines (stand-alone additions) | 35 |
| Previous report | Number (8) | Report number of line to be corrected | 36 |
| Previous line | Number (8) | Line number of line to be corrected | 37 |
| Comment | Character (256) | Operator comment | 38 |
| Burn-up | Number (6) | Burn-up in MWdays/tonne (use for IC codes NL and NP in nuclear reactors only) | 39 |
| CRC | Number (20) | Hash code of line for quality control purposes | 40 |
| Previous CRC | Number (20) | Hash code of line to be corrected | 41 |
| Advance notification | Character (8) | Reference to advance notification sent to the ONR (use for IC codes RD, RF, SD, SN and SF only) | 42 |
| Campaign | Character (12) | Campaign identifier for qualifying nuclear facilities which carry out reprocessing | 43 |
| Reactor | Character (12) | Reactor code for reprocessing campaigns | 44 |
| Error path | Character (8) | Special code for evaluation purposes | 45 |
