I have this CD:
There are three identical editions: correct barcode, cat number and cover.
Can I also set Length for GB and DE editions?
Sorry, re-read your question. Only set the length for the one you hold in your hand. (Does it say MADE IN GERMANY BY EDC on the matrix?)
It would be a guess to set the GB and German editions. Especially as I see 27 CDs matching that barcode at Discogs, and 11 of those are UK and\or Europe.
It is very likely these are the same DiscID in many cases, but you can not be sure.
German manufacturing changed hands many times, but usually the same DiscID was used for decades. Usually. But we are not always 100% certain.
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You have my geeky curiosity going now… so I looked closer
Basically we need more examples of DiscIDs on the other releases. This is why it is handy to note a verified discID in the annotation. Looking at the German and GB editions it is very likely that those pre-NGS discIDs listed are CD-Rs. They are just so much bigger than the disc you hold in your hand.
EDC, PMDC, Universal, PDO… all the same company who pressed the same disks for years from the same plant. And usually the same DiscID throughout that time.
My doubt due to lack of evidence here would leave them alone…
Comment from POWER VOTE userscript:
NGS was released on 2011-05-16, last pre-NGS Edit #14459455, first NGS Edit #14459456
The POWER VOTE userscript shows you, in edit searches, which edits are pre-NGS:
The last Disc ID was added recently and all the others are pre-NGS, and notice how they add the same disc ID to 6 releases.
At that time it was only 1 release, but NGS has split this into several releases, and now the edits show you the resulting split releases.
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You can probably safely detach a fair number of them. Here are some rules of thumb you may want to observe when doing so.
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Why do I have to put TOC in a note when everything is in the edit history?
I am not suggesting adding the TOC to the annotation. Just a link to the DiscID.
Everything is not in the edit history. For very old Releases that have been in the database a long time many DiscIDs will not be listed in the history. Filter the history of that U2 release and notice there are only a few of those 18 DiscIDs listed. And you can’t find when the good ones were actually added.
Where there are a heap of unknown DiscIDs attached to a release it can be useful to add Matrix Details and a DiscID into the annotation to help others sift through the chaos.
I can be brutal with my flame thrower removing discIDs, but know to be careful and only take out ones that are obviously wrong. I try and err on the side of caution.
And I should talk up the POWER VOTE script that adds those strippy lines into the history. Being able to spot the pre-NGS stuff so easily is a huge bonus. It is actually why I took that guess of May 2011 as to the timing of NGS after looking in that edit history of the U2 album. 
Is TOC or not Disc ID?
A DiscID is a number: 65Kxq8ayoWzrbIpAesWCbqEr61c-
It represents a Table of Contents (TOC) for a specific CD
Track Start Length End
Time Sectors Time Sectors Time Sectors
1 0:02 150 3:50 17263 3:52 17413
2 3:52 17413 4:19 19412 8:11 36825
3 8:11 36825 4:59 22420 13:10 59245
4 13:10 59245 4:41 21050 17:51 80295
5 17:51 80295 4:42 21158 22:33 101453
6 22:33 101453 5:52 26380 28:24 127833
7 28:24 127833 4:36 20710 33:01 148543
8 33:01 148543 3:38 16362 36:39 164905
9 36:39 164905 4:55 22133 41:34 187038
10 41:34 187038 3:03 13722 44:37 200760
11 44:37 200760 3:00 13483 47:37 214243
12 47:37 214243 4:18 19357 51:55 233600
13 51:55 233600 3:50 17260 55:45 250860
14 55:45 250860 9:52 44393 1:05:37 295253
The same thing, just one is easier to post as shorthand as it links to the other.
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Echelon69You are now talking about a totally different release. And an edit you have made just now.
All edits you make are in the edit history. Not all edits for adding DiscIDs before 2011 are in the edit history
I would ask why you added a new release for that one as it seems to already be here: https://musicbrainz.org/release/8c16bb1b-7a86-3e3e-9dc6-70f125f04f7c But then we’d be way off topic…
You don’t understand.
The Disc ID link is in the history, so why add it in the note?
Answer to second question is also in the topic.
My Disc IDs were not in the database.
UPDATE
You’re right. My fault. I don’t know what happened in this case. After all, this isn’t the first album I’ve released.
Maybe I’ll explain it this way:
I put CD1 Forrest Gump into the drive and open Picard, Lookup CD.
Result:
1
Then I click Submit ID. It takes me to this window:
2
However, I still have to enter the title to show all editions.
3
Only then can I select Barcode, etc. in image 4.
When 18 DiscIDs on a release it helps to get a clue as to which are likely the legit ones. Only really relevant on really old releases that are pre-NGS and have that big old mess.
As to the Gump duplicate - maybe check the Release Group and look for a match manually first before adding something new?
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I think the best place to tell that that disc ID is verified (and how), is in its Add Disc ID edit, itself. 
In the annotation, it’s strange for a 18 disc ID release.
If I verified something, I would have split the release to a new release with that unique verified disc ID.
Exactly for this case, I recommend it! Track lengths are easily re-set. It is much easier to check when it is displayed in the overview page. Some editors may even look at it, before they set new track lengths (or add another disc ID). But I would be happy if it’ll be noted in the respective edit note - hopefully the Matrix code and not “CD in hands” (cat#/barcode may be ambigious)
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What does Verified DiscID mean?
Photo proven?
Since I have a real CD in my hand, Picard reads the Disc ID itself.
I don’t come up with a string of characters myself:
jvwhavahvhahbve-
It means release in hands, CD in drive, Disc ID computed by Picard.
But @IvanDobsky write re to put it in a note.
WHY ??
The case regarding the album U2 - The best of 18 DiscID
Maybe 17 people (except me) reached only this stage:
and approved this one edition.
They did not enter the title manually and thus did not learn about other editions or the full list.
If you document additional information, it becomes easier for future editors to verify that your DiscID truly matches the associated entry. As @ernstlx remarked upthread, this ideally means you noting down the matrix code of your copy. Several editors have adopted the habit of adding this information, together with the DiscID in the annotation field, as for example in this release:
If you like, you may also add that information to the edit note, instead of the annotation field. Bottom line is that the more information you document, the easier it becomes to weed out the incorrectly linked DiscIDs from those burdened release entries.
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