Make a column nullable in DB2 when Data Capture is enabled

My final query ended up something like this:

ALTER TABLE MY_TABLE DATA CAPTURE NONE;
ALTER TABLE MY_TABLE ALTER MY_COLUMN DROP NOT NULL;
ALTER TABLE MY_TABLE DATA CAPTURE CHANGES;

the documentation says that the ALTER TABLE has the possibility to DROP NOT NULL

ALTER TABLE TABLE_NAME ALTER COLUMN COLUMN_NAME DROP NOT NULL;

works in DB2 9.7 and above. How ever you might want to perform a table reorg (in 9.7 db2 puts the table in reorg pending state, the same in 10.5 FP 5 too):

call sysproc.admin_cmd('reorg table TABLE_NAME');