DD VTL Export tapes to vault

Hi I need some help, i'm trying to delete a tape from the VTL but it said that i can't delete it 

when do it from gui it does work but when trying via CLI i can't do it. 

I'm getting the following: 

... deleted 0 tape(s)...

tape xxxxxL4 in pool XXXX_XXXXX is loaded in library XXXXXXXXX

So while doing it on the gui it said exporting tape and then deleting tape. I'm looking the list of commands that i need to sucessfully delete the tape, i presume that first i need to export the tapee somewhere and then i will be able to delete, but not finding any command related to do the action i need.. 

Any help would be highly appreciated.