Enable Unicode column data to be processed by applications written to process Latin or Kanji1 character data. The expected export width multiplier for this case is 1 with an adjustment of 0.
Assume that you have changed your Kanji1(n ) columns to Unicode(n) columns, so you always want your exported character strings to have n bytes. Because of this, Compatibility mode does not add any bytes for Shift Out/Shift In support for mainframe systems.
Your Kanji1 column was already designed to store Shift Out/Shift In characters, and the corresponding new Unicode definition enables data exported to a mainframe client to have enough room to include those Shift Out and Shift In characters.