Gianfranco --
Apply the Task Sheet view and temporarily insert the Show on Board column. Set the values of the tasks in question to Yes and that should solve the problem. Hope this helps.
Hi Dale,
thanks for your suggestion.
It would not let me fix the issue per se, but gave a fundamental hint to do so.
The tasks already had field "Show on Board" set to "Yes".
I figured out there had to be a filed for the bucket they were assigned to, which I found to be "Board Status".
Once shown, I found the name of the bucket they were assigned to in the Project file I copied them from had a one-letter difference from the corresponding one in the receiving plan.
Hence, in the receiving plan they were assigned to no existing bucket, thus not shown in the board, though they were set to be.
Gianfranco