Digital BW, The Print

hi all... i think i recall reading about this but haven't found the thread in the archive.

i just borrowed a 2200 to try out the BO method with MIS Eboni.  i installed the eboni 
cartridge in place of the normal epson black.  when i tried to print i got an error 
saying that the "ink cartridge combination currently installed is different from the one 
installed when the printer was selected in print center," instructing me to 
delete the printer and re-add it in the print center.  i did so and then got the same 
error again.

ideas?