| Код | Текст ошибки |
| 2 | Product not found |
| 4 | Order with that number (order line) is already exists in the MONT system |
| 6 | Credit limit exceeded |
| 8 | Order line number field is not specified |
| 10 | Product is blocked |
| 12 | The license form has not been specified |
| 16 | Reseller is blocked |
| 17 | Quantity is incorrect |
| 25 | Invalid format for the order line number. For Microsoft products, the line number must not exceed 32 characters. |
| 61 | Subscription not yet activated |
| 71 | Order number field is not set |
| 72 | There are no order lines in the order |
| 75 | Subscriber with the specified code was not found |
| 76 | Subscriber with the specified code was not activated |
| 87 | No subscriber specified for a subscription |
| 101 | Internal server error |
| 200 | Incorrect EndUserInfo Data |
| 900 | You do not need an activation form for that product |