Role learning after full system learning

I have done a full system policy learn, but i need further refinement for a particular role. Setting the l flag for this role in the newly generated policy file, i get the folowing error message when checking with gradm -C :
"Subjects are not allowed for a role with learning enabled, as they are generated by the learning mode"
How can i teach this role without deleting the already learnt subjects?
"Subjects are not allowed for a role with learning enabled, as they are generated by the learning mode"
How can i teach this role without deleting the already learnt subjects?