user mapping

Hi,

While creating a JCO destiation in WAS 6.40 SP5, on the screen for maintaining user data, I see an option 'user mapping'. I am not sure what this option is for and where this user mapping is maintained.

Nothing is mentioned in SAP documentation on JCO destination creation as well for this 'user mapping' option.

Does anyone have any idea what is the purpose of this option and how it can be used?

Regards,

Aniket