Adjustment fields are text fields in the GUI that allow you to enter some text that will cause a particular calculation to be applied to a numerical or monetary value. They will disallow any text that does not describe an adjustment operation. There are the following adjustment operations:
| Operation | Explanation |
| + | add the following amount to the value (the default operation so the '+' can be missed out) |
| - | subtract the following amount from the value |
| % | calculate a percentage of the amount |
| ~ | round the value to the nearest multiple of the following amount |
Only a single adjustment operation can be carried out.
Examples of valid adjustments and their effect:
| Value | Adjustment Text | Result |
| 1000 | <blank> | 1000 |
| 1000 | +10 | 1010 |
| 1000 | +10% | 1100 |
| 1000 | 10 | 1010 |
| 1000 | 10% | 1100 |
| 1000 | -10 | 990 |
| 1000 | -10% | 900 |
| 1000 | ~10 | 1000 |
| 1000 | ~9 | 999 |
| 1000 | ~11 | 1001 |