# 2.90e -- A mapped field (YEAR in my case) is getting duplicated in OGG Vorbis files

**URL:** https://community.mp3tag.de/t/2-90e-a-mapped-field-year-in-my-case-is-getting-duplicated-in-ogg-vorbis-files/43607
**Category:** Fixed Bugs
**Tags:** bug-fixed
**Created:** [November 19, 2018, 8:05pm UTC](https://community.mp3tag.de/t/2-90e-a-mapped-field-year-in-my-case-is-getting-duplicated-in-ogg-vorbis-files/43607 "2018-11-19T20:05:31Z")
**Posts on this page:** 1
**Showing post:** 2

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### Author: ![Florian](https://community.mp3tag.de/user_avatar/community.mp3tag.de/florian/32/5759_2.png) [@Florian](https://community.mp3tag.de/u/Florian)
#### Post date: [November 21, 2018, 12:08pm UTC](https://community.mp3tag.de/t/2-90e-a-mapped-field-year-in-my-case-is-getting-duplicated-in-ogg-vorbis-files/43607/2 "2018-11-21T12:08:03Z")

</div>

With mappings from two different source fields to one target field, you're essentially writing the same data back to those two different fields whenever you're performing a change.

With mappings

- `DATE` to `YEAR` and
- `TDRC` to `YEAR`

you're reading the data from the two different source fields, but also writing back any content of the `YEAR` field to those two mapped source fields.

Until v2.90e, I was dropping identical values for mapped fields, so that only one `YEAR` field was displayed in Mp3tag. This resulted in the bug report [Identical multivalue tag won't be written if mapped](https://community.mp3tag.de/t/identical-multivalue-tag-wont-be-written-if-mapped/11432)

Now with v2.90e, I've made the following change

- FIX: multiple occurrences of a mapped field with identical values were displayed as one. ([#11432](https://community.mp3tag.de/t/11432))

so that on reading mapped fields which have the same value, I'm not dropping duplicates anymore. This also means, that a file with both `TDRC` and `DATE` filled with the same value, are now displayed as two `YEAR` fields. When writing back the change to the file, the two-valued `YEAR` field gets mapped to both `TDRC` and `DATE` which are then also multi-valued and so on.

It's clear that this is not optimal and will probably result in headaches for those affected by this behavior. I'm open for feedback. At the moment it seems to me, that the decision is living either with this issue or the referenced issue.

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_[View the full topic](https://community.mp3tag.de/t/2-90e-a-mapped-field-year-in-my-case-is-getting-duplicated-in-ogg-vorbis-files/43607)._