| UC_NO_CHAR_NUMBER | The result cannot be calculated as a number of characters. |
| UC_OBJECTS_NOT_CHAR | The current statement is only supported for character-type data objects. |
| UC_OBJECTS_NOT_CHARCONV | The data object cannot be converted into a character-type type. |
| UC_OBJECTS_NOT_CHARLIKE | The current statement is only supported for character-type data objects. |
| UC_OBJECTS_NOT_COMPARABLE | Data objects in Unicode programs cannot be compared. |
| UC_OBJECTS_NOT_CONVERTIBLE | Data objects in Unicode programs cannot be converted. |
| UC_OBJECTS_NOT_NUMLIKE | The current statement only supports numerical type data objects. |
| UC_OBJECTS_TABLINE_NOT_CHAR | The current statement is only supported for character-type objects. |
| UC_OBJECTS_TL_NOT_CHARLIKE | The current statement is only supported for character-type objects. |
| UC_STRUCLENG_INCONSISTENT | Inconsistency in the length of structure type &P1 |
| UNCAUGHT_EXCEPTION | An exception has occurred that was not caught. |
| UNCAUGHT_EXCEPTION_NOTE | A non-existent exception has been raised. |
| UNEXPECTED_RUDI_SECTOR | Address &P1 of type description &P3 has an invalid sector. |
| UNEXPECTED_RUDI_TYPE | Invalid type in address &P1 for type load &P3 |
| UNICODE_TYPES_NOT_CONVERTIBLE | The types of operands &P2 and &P3 are not mutually convertible. |
| UNKNOWN_NUMBER_FORMAT | Numbers stored in an unknown format. |
