AS/Set problem

I have copied a standard BPCS program and removed a number of the Panels
from the program in order to provide a cutdown version for the local users
(and modify some of the logic).
I added a selection screen to accept the parameters and call the sub-file
screen to display the output.
When I preprocess the As/Set definition I am getting the errors 
"Error: Key field xxxxx not defined in program"
"Error: Key fields attributes in file YYYL01 do not match"

I have not defined the field xxxxx anywhere in the definition and cannot
find the error reference in the spooled output from the pre-processor.


Any help would be greatly appreciated.

Andrew
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