| 0 | Query has been performed successfully |
| -1 | Check does not exist |
| Class: Access to non-existing check | |
| -2 | Check does not support this query |
| Class: Invalid query on check | |
| -3 | The Check was never active |
| Class: Invalid query on check | |
| -4 | No event has occurred |
| Class: Information | |
| -5 | Pointer to CAPL-Argument is NULL |
| Class: Invalid test specification | |
| -6 | There are multiple objects that match on this query |
| Class: Ambiguous query. Multiple objects match on this query | |
| -7 | Node layer module is deactivated and cannot process the query |
| -8 | Variable overflow detected |
| -9 | Check is evaluated asynchronously. Function requires an existing check that is executed synchronously. |
| -10 | Check is not evaluated asynchronously. |
| -11 | Data was queried but not yet received from asynchronous evaluation. |
| -12 | Data was used later than it was requested. Data may be outdated. |