wdisp/max_permission_table_entry_size is a SAP Parameter attribute which is used to control URI permission table: max. size of one table entry in characters 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 .
Maximum length of a table entry (a row) in the URI permission table of
the SAP Web Dispatcher.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.