Dear Carlos
I have checked in ACS GUI and found that the option Row Access Control runs this ALTER TABLE QIWS.QCUSTCDT ACTIVATE ROW ACCESS CONTROL (check the option and click Show SQL to see this).
Assuming your IBM i server at issue is at release 7.2 or later, I have a guess. Since a table must first be activated for row access control to be defined (and can also be deactivated), it may be possible that your table EMAILDIRE was already activated for row access control and ACS may be designed to be able to detect this (and remove the option from the GUI) while the old System i Nav is not. I think you can check on this by running DSPFD against EMAILDIRE or display its Descriptions from ACS GUI to see if you see such an activation.
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Satid S
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