Using EIM task user cannot normally update User key attributes of the base table. However, there are some special interface tables EIM_ORG_EXT_UK and EIM_PROD_INT_UK that can be used to update user key columns for some key tables S_ORG_EXT and S_PROD_INT.
Updating user key columns using EIM task with these special tables will not update denormalized columns. For example, updating S_ORG_EXT.LOC will not update S_ACCNT_POSTN.ACCT_LOC AND S_ORG_BU.ORG_LOC.