When submitting ISRCs for a multidisc release, the ISRCs will always get added to the tracks of the first medium and not to the tracks of the medium to which the discid is attached.

For the discid "Y0uRcyt2DyoyA9mnW6E4X0._Eis-" and the following release, the ISRCs get attached to:
http://musicbrainz.org/release/b8b4ba62-990f-4f2c-8a26-135e677036a4.html

1. http://musicbrainz.org/track/5db87121-643a-4936-853d-94283b3097a0 => DEQ321000136 (already in MB)
2. http://musicbrainz.org/track/f95c0c99-9c19-454e-8bf5-f9e875efc96c => DEQ321000137 (already in MB)
3. http://musicbrainz.org/track/6b2238be-7bbe-439b-8012-a85c903bc843 => DEQ321000138 (already in MB)
4. http://musicbrainz.org/track/f8141c99-c667-4ade-a2b0-280dd6ec727d => DEQ321000139 (already in MB)
5. http://musicbrainz.org/track/b0ac73f6-a18a-400d-ad9c-f0148da6180f => DEQ321000140 (already in MB)
6. http://musicbrainz.org/track/47bbf070-3e5f-4dde-9d7a-177329391ef4 => DEQ321000141 (already in MB)
7. http://musicbrainz.org/track/3f1b3ee8-75de-42f9-8cee-d6c80c1d3f85 => DEQ321000142 (already in MB)
8. http://musicbrainz.org/track/f3b87736-74a2-431a-a04a-ba2a75292e3d => DEQ321000143 (already in MB)
9. http://musicbrainz.org/track/92a0ed41-f94b-4e87-931d-954b2600422d => DEQ321000144 (already in MB)
10. http://musicbrainz.org/track/0137e082-a35e-4e82-9094-76ed97ad7761 => DEQ321000145 (already in MB)
11. http://musicbrainz.org/track/ed36c256-c4bc-417b-abde-7fea7048f7bc => DEQ321000146 (already in MB)
12. http://musicbrainz.org/track/c0ced69e-e6c2-45c6-9813-1634c23556f8 => DEQ321000147 (already in MB)

Instead they should get attached to the following tracks:
1. http://musicbrainz.org/track/46499d1b-8acf-4dee-ae3e-893d71532820 => DEQ321000136 (already in MB)
2. http://musicbrainz.org/track/6a70f113-a3ed-4cd0-a04d-459b07d24b96 => DEQ321000137 (already in MB)
3. http://musicbrainz.org/track/8e3de5d9-acf5-457d-a9e7-25a69b88959b => DEQ321000138 (already in MB)
4. http://musicbrainz.org/track/d7ea526c-2788-4f6d-8321-34f9e654475c => DEQ321000139 (already in MB)
5. http://musicbrainz.org/track/8b47092e-8d24-4e29-9b27-97afc6e1a0ce => DEQ321000140 (already in MB)
6. http://musicbrainz.org/track/a7e84bd3-77d1-4269-a9ad-635e89f7e9ec => DEQ321000141 (already in MB)
7. http://musicbrainz.org/track/d079e742-eb85-4d6a-b33d-dc69afb9af36 => DEQ321000142 (already in MB)
8. http://musicbrainz.org/track/d0277718-de43-4937-afcc-e212fc4bbcd9 => DEQ321000143 (already in MB)
9. http://musicbrainz.org/track/b3956c7c-0ea5-49ea-b84e-5e35f5290a15 => DEQ321000144 (already in MB)
10. http://musicbrainz.org/track/ed358f5e-a462-47dd-8286-e42a4acb9e9e => DEQ321000145 (already in MB)
11. http://musicbrainz.org/track/566294dd-e6c1-4d49-8985-47cc9580f735 => DEQ321000146 (already in MB)
12. http://musicbrainz.org/track/28f36154-2f7d-4e14-9a45-e311dbabe8df => DEQ321000147 (already in MB)