text: **14.4 Customizable user exits**
  
  ODF provides several user exits with which you can tailor the system to meet your 
  installation’s requirements. You can optionally use the sample exits that are provided or 
  customize the exit to meet your specific needs. 
  
  **14.4.1 arsodfxa: Spool file dataset allocation attributes exit**
  
  You can use the**arsodfxa**spool file dataset preallocation exit to modify the currently defined 
  ODF JES spool file dataset output parameter definitions that are used for dynamic allocation 
  of the report and manifest JES spool file datasets. The**arsodfxa**exit is called when ODF 
  detects a non-blank Customer Variables field in either the ODF distribution or report bundle 
  definition, but only if the field value is not set to DO NOT SCHED or NOSCHED. 
  
  The output parameters that are specified in the report bundle definition and the output 
  parameter string are passed to the**arsodfxa**exit. The exit can modify the output parameter 
  string. The string that is returned from the user exit is used to allocate the JES spool file 
  datasets for the report bundle and manifest JES spool file datasets. 