Same repositories IDs in settings.xml and POM are not detected

When the same repository ID is used in repositories defined in 

1. settings.xml and
2. POM

the one from the POM is just silently ignored and no ERROR is emitted.

OTOH when defining repositories with the same ID in POM the following error is emitted:

[ERROR] Some problems were encountered while processing the POMs:
[ERROR] 'repositories.repository.id' must be unique ....

A similar error should be emitted for repository ID clashes in settings.xml (both local and global) and POM