TYPO3 Core

BE users can edit multiple records in the Web | LIST module in one go by clicking the "edit" icon in the appropriate column (Single Table View). The list of records may contain various types (e.g. page types if you edit multiple sub pages in this view). This means the value you chose for editing may be optional or mandatory. TYPO3 does not respect this which causes in invalid error message (see below) and does not allow to save the changes.

For example: assuming a system contains a folder with 6 sub pages. 5 of those sub pages are "External URLs", one of them is a standard page. If a BE user tries to update the URLs of the 5 pages in one go, he should go to: Web -> List -> (parent page) -> Single Table View appears.
He clicks the (+) symbol, activates "URL" in the box below -> "Set fields" button -> clicks the "edit" icon at the column "URL".
Six input fields appear (each for every sub page). One of the 6 pages is not a "Link to an external site", so the URL field is empty. It is not possible to leave this empty (which is correct for a "standard page"). If you try to save your changes (with an empty field), the following error message appears:

"The fields marked with a yellow exclamation mark are not yet correctly filled in. Please complete them properly."

Fact is that a "standard page" does not require an URL. Workaround (from an editor's perspective) is to enter "something" in the URL input field to be able save the records, however this is technically incorrect.

(issue imported from #M17841)