Bad Maven dependency version not flagged as red

>If I do the same mistake in a sub-module pom, it will get flagged as an error.

Do you also have it under dependencyManagement section? The validation only happens (Inspections | Maven | Maven Model Inspection inspection) for dependencies which are really used in project (that are not included into dependencyManagement).

> Do you also have it under dependencyManagement section?

Yes, I use the dependency in a submodule. I don't declare the version in my submodule, just in the parent-pom "dependencyManagement" section.

So, in the master-pom under dependencyManagement, like code example in the question and in the submodule-pom as a "normal" dependency.

But even if the master-pom version is incorrect it is not red-flagged.

>> Do you also have it under dependencyManagement section?

>Yes,

it seems to me the above statement contradicts with:

>So, in the master-pom under dependencyManagement, like code example in the question and in the submodule-pom as a "normal" dependency.

Please clarify again: do you have the dependency which is highlighted as error under dependencyManagement section or not?

As mentioned:

The validation only happens (Inspections | Maven | Maven Model Inspection inspection) for dependencies which are really used in project (that are not included into dependencyManagement).

So if it is under dependencyManagement section it will not be highlighted.

Master pom.

<dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>some.group.id</groupId>
      <artifactId>the-name</artifactId>
      <version>${misspelled-version-ie-non-existing}</version> <!-- should be red, right? -->
    </dependency>
  </dependencies>
</dependencyManagement>

In module pom 

<dependencies>
  <dependency>
    <groupId>some.group.id</groupId>
    <artifactId>the-name</artifactId>
  </dependency>
</dependencies>

Are erroneous versions never flagged in the dependencyManagement-section? 

>Are erroneous versions never flagged in the dependencyManagement-section?

Yes, as noted in my first comment, they are never flagged. Feel free to file a request at https://youtrack.jetbrains.com/issues/IDEA.