Synaptic Error: Duplicates in sources.list

[Klaus Jantzen <k.d.jantzen@mailbox.org>]

Hello,

I am still running Wheezy.

When using Synaptic to upgrade Wheezy the following message is issued:

=========
W:Duplicate sources.list entry ..
(/var/lib/apy/lists/security.debian.org_dists_wheezy_updates_main_binary-amd64_Packages
W:Duplicate sources.list entry ..
(/var/lib/apy/lists/security.debian.org_dists_wheezy_updates_main_binary-i386_Packages
==========

I removed the two entries in the directory but with the next start of
Synaptic the error appears again.

What do I have to do to remove these entries permanently?

Thanks.
-- 

K.D.J