I have created a task metadata isheet, and one of the columns is a lookup column. When I create a task from the task module, and select a record from the lookup column, after saving I am not able to modify it if I try to from the task module. However, if I select the option to edit details from the isheet view, I can modify it.

It should be possible to modify the record selected in the lookup column also from the task module, it is not user friendly that you can modify the rest of columns from the task module but not the lookup ones.