If status key 1 contains "1" to indicate the AT END condition, status key 2 can contain one of the following values: 
| "0" | (all files) Indicates that there is no next logical record. This can be caused by two conditions: 
The end of the file has been reached. A sequential READ statement has been attempted for the first time on an optional input file that is not present.  | 
| "4" | (relative files only) Indicates that the number of significant digits in the relative record number is larger than the size of the relative key data item described for that file. |