Required fields in entry editor are incomplete

[systemoperator]

I have looked at the different entry types of biblatex in http://mirror.easyname.at/ctan/macros/latex/contrib/biblatex/doc/biblatex.pdf (p. 8ff, 2.1 Entry Types). Here, I have observed that some entry types define that either the entry field "year" or "date" (year/date) is required. Contrarily, JabRef only shows the entry field "date" as required. The entry field "date" is only shown in "Other fields". This can confuse some users.

One example:

Entry type: article
biblatex: Required fields: author, title, journaltitle, year/date
JabRef shows the following entry fields as required: author, title, journaltitle, date

This could also lead to a problem, when pasting references, where only year={yyyy} is set.

Maybe it could be defined more clearly in the required fields, that either the field "year" or "date" is required. (Of course I see, that the date also includes the year.)

Affected entry types are:

article, book, mvbook, inbook, booklet, collection, mvcollection, incollection, dataset, manual, misc, online, patent, periodical, proceedings, mvproceedings, inproceedings, report, thesis, unpublished

Furthermore, for the entry types:

• "misc" the following is defined as required: author/editor, title, year/date
  • But in JabRef required are: author, title, date
• "online" the following is defined as required: author/editor, title, year/date, doi/eprint/url
  • But in JabRef required are: author, title, date, url

[Siedlerchr]

@systemoperator
Are you sure you have your library in biblatex mode?

Year + month are aliases to the field date. JabRef can interpret date from year + month and also the other way round to some extend. Not all biblatex date formats can be entered atm. See #2753
Therefore it's only necessary to show the date field. And biblatex is backwards compatible see section §2.3.9.

author/editor: Those are both present:

And JabRef has also special logic to serialize them and parse them.
You can see all EntryType/Field related defintions in JabRef here:
https://github.com/JabRef/jabref/tree/master/src/main/java/org/jabref/model/entry

[systemoperator]

@Siedlerchr Yes, I have biblatex mode enabled: I have set it for the current library as well as in the JabRef settings in general ("Default bibliography mode").

I'm using the latest JabRef 5 master build (JabRef-5.0-portable_linux.tar.gz, JabRef 5.0-beta.357--2020-01-18--6319d05, Linux 4.4.0-171-generic amd64, Java 13.0.2) on Ubuntu 16.04.

Concerning the entry type "misc", there is no "Editor" field visible:

Add: I have now also tested the latest jabref_5.0-1_amd64.deb master build. I can observe the same here: When I create a new reference with the entry type "misc", then no "Editor" field is visible in the "Required fields" tab of the entry editor.

I have tried pasting a new biblatex entry, where the entry field "date" is not declared but the entry fields "year" and "month" are set:

@Article{Xxx2007,
  author       = {Xxx, Abc},
  journaltitle = {jtitle},
  title        = {title},
  pages        = {1906--1920},
  month        = jul,
  year         = {2007},
}

After saving the library and selecting a different reference and switching back to the newly added one, I see that in the tab "Required fields" the required field "Date" is still empty. Is this fine? A user could think, that this reference is incomplete, although a year and month is declared.

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