Hi,
thank you for the help. i actually solved it with this link here:
https://community.checkpoint.com/t5/Management/How-to-release-lock-from-objects-in-R80-10/td-p/6969#
with this command:
psql_client cpm postgres -c "SELECT objid, name, dlesession, cpmitable, subquery1.lockingsessionid, subquery1.operation FROM dleobjectderef_data, (SELECT lockedobjid, lockingsessionid, operation FROM locknonos) subquery1 WHERE subquery1.lockedobjid = objid and not deleted and dlesession >=0;"
Then, delete the object from locknonos db-table to release it.
psql_client cpm postgres -c "delete from locknonos where lockedobjid='[objid-from previous command]';"
cpstop;cpstart to restart the services.
AND ALL WORKS FINE!!!