Currently, the validation of contributions saved on our database does not go through important accessibility check that must be executed before object insertion.

Namely, the following checks should be performed:

• When the user inserts a data format, that all referenced data formats are accessible
• When the user saves an algorithm that all referenced data formats are acessible
• When the user saves an experiment, that databases, algorithms, analysers, data formats and environments are accessible.

When all these items are checked, we can safely close this bug.