Diagnosis
You want to buffer a table generically, but specified an incorrectnumber of key fields. For generic buffering, you must specify a numberof key fields between 1 and n-1, where n is the number of key fieldsin the table. If the table has only one key field, generic buffering isnot possible.

Procedure
You can find out the possible number of key fields using the input helpin the corresponding entry field. Select one of the numbers given there.