rdisp/reinitialize_code_page is a SAP Parameter attribute which is used to control Reinitialize code page when processing request? 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 .
A default code page is assigned to every server. This is set up when
starting the server in the work processes. The ABAP runtime then
switches to the relevant code page according to the user language.
Parameter rdisp/reinitialize_code_page controls if the work process is
first to set up the system code page during the transfer of a new
request. This is usually unnecessary.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.