How does LANGU field is picked up by SETHEADERT Table

Hi ,

When we are loading cost center alternate hierarchy data for Japan through IDOC from BODS, description of the CostCenter Groups are loaded in SETHEADERT table and this table picks up  LANGU field ( language) automatically from T002, it has to pickup JA but its picking up EN (english). On what basis it picks up the language as this is picking up the wrong language.

Please let us know so that we can modify any configuration accordingly.

THanks

Madhu