ORA-00054: resource busy and acquire with NOWAIT specified or timeout expired

Hi all

I would ask you if you have experiences with ora-00054 connected with alter table truncate partition drop storage .

Our developer use ETL witch creates a lot of independent jobs and part of it is alter table truncate partition drop storage .

But each job truncates different partition in the some table .  This partition table doesn't have index , constraints (only  check not null )

can you explain me where could be problem ?

Thank Tou Brano