Does anyone know why this is happening, and what can be done to avoid it? Thank you!
4 réponses

According to the documentation..you can create a task/event if you:
Have the “Edit Tasks” and “Edit Events” permissionsAND
Have at least read access to a record, if associating the activity with another record
https://cs3.salesforce.com/help/doc/user_ed.jsp?section=help&target=security_sharing_rule_considerations.htm&loc=help&hash=topic-titleActually this is new info for me..