| "0" | (all files) Indicates that no further information is available concerning the cause of the error. | 
| "4" | (sequential files only) Indicates a boundary violation. An attempt has been made to write beyond the externally defined boundaries of a file. | 
| "5" | (all files) Indicates that an OPEN statement with the INPUT, I-O, or EXTEND phrase has been attempted on a non-optional file that is not present. | 
| "7" | (all files) Indicates that an OPEN statement has been attempted on a file which does not support the open mode specified in the OPEN statement. The possible violations are: 
The EXTEND or OUTPUT phrase has been specified but the file does not support write operations. The I-O phrase has been specified but the file doesl not support the input and output operations that are permitted for a relative file when opened in the I-O mode. The INPUT phrase has been specified but the file does not support read operations.  | 
| "8" | (all files) Indicates that an OPEN statement has been attempted on a file previously closed with lock. | 
| "9" | (record sequential, relative and indexed files) Indicates that a conflict has been detected between the fixed file attributes and the attributes specified for that file in the source element. |