Diagnosis
At least one scheme in the list has not been assigned a key.

Procedure
The key is used to group identical schmes. All schemes must be assigneda key.
Example
AA MED SCHE_W
AA MED SCHE_M
BB MED SCEME2
CC MED SCHEM3
In the above example the first 2 schemes have been grouped and areidentical. The 3rd and 4th schemes are different.