Geomajas Community Documentation
You, as the submitter of a problem, know exactly what you were doing when you were hit by the problem. However, most other people probably don't. For instance, they may have a completely different workflow for doing the same things you are doing.
In order to prevent committers to have to ask back how exactly an issue can be reproduced, it is the task of the issue's submitter to be as clear on this as possible - preferably by given a step-by-step description.