The application requested to open a file for append or update. The same base file name (a parent) is already open and the base file is not a PDSE and not a member of a partitioned data set. You cannot open a file for append or update if there already exists an open file with the same base name unless it is a PDSE or member of a partitioned data set.
Correct the application.
JrEdc1opsEisopen07