Sometimes however, you may find that you are unable to log into the system using one of the languages that are installed. You get prompted to select a valid language.
This is usually due to a miss-configuration of the zcsa/installed_languages profile parameter.
You can check the system language configuration using the report RSCPINST.
You should note that the zcsa/installed_languages parameter should be set in the DEFAULT profile *only*.
Some useful SAP notes on language packs:
73606 “Supported Languages and Code Pages”
352941 “Languages and Support Packages”
533888 “Example for Language Import and Errors”