"The source path must be contained in the project root folder"

I'm new to VS Code and now trying to convert an Eclipse project to VS Code.
I have multiple Java projects stored in a common folder.
Each project have its own .vscode/settings.json file.
The projects refer to each other on source level as which requires cross-project references.
The projects are unmanaged using VS Code terminology.

Environment

• Operating System: Mac Sonoma 14.4.1
• JDK version: 21
• Visual Studio Code version: 1.88.1
• Java extension version: 1.29

Steps To Reproduce

1. Try to add a source path from another project in the folder.
   Then you get the error message from the issue.

[Please attach a sample project reproducing the error]
Please attach logs

Current Result

Expected Result

Additional Informations

If this will be addressed, I think "sourcePaths" should permit relative and absolute paths to any folder.

Inizia riproducendo l'errore con più progetti Java e i relativi file .vscode/settings.json. Esamina come viene convalidata l'impostazione sourcePaths quando fa riferimento a una cartella al di fuori della radice del progetto. Il lavoro è completato quando il percorso di origine tra progetti previsto viene accettato ed esiste una copertura di regressione per la configurazione segnalata.