In version 3.1.1 I had to fix two files to get it working properly: 
1) /modules/advancedeucompliance/classes/AeucEmailEntity.php
2) /modules/advancedeucompliance/views/templates/admin/emailattachmentsform.tpl 
In 1) Line 49: changed 'idaeucemail' to 'idmail'
in 2) Lines 63, 66, 67: changed '$mail.idaeucemail' to '$mail.idmail' 
Otherwise the bankwire module (maybe all other payment methods too) did not work in checkout and the settings (additional e-mail content) in the aeuc module were not saved. 
I think in /modules/advancedeucompliance/classes/AeucCMSRoleEmailEntity.php there is a similar bug in line 49 where 'idaeuccmsrole_email' should be changed to 'id'. In my installation I could not see any effects before and after changing it. 
Could one of the developers test this and update the module if necessary.