rspo/spool_id/use_tskh is a SAP Parameter attribute which is used to control Controls how numbers for new spool requests are created information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
This parameter chooses the procedure for determining the spool ID
numbers. The default value 2, number of number range manager, may not be
changed.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.