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   1020   Data Type Error or Work Area Not Indexed

   Problem 1:  An invalid data type was assigned to a field in a table.

   Solution 1: Correct the program. If assigning a value to a field in a
   table from some variable, make sure the variable has been initialized
   (i.e., is not NIL).

   Problem 2:  An operation, such as a Seek, was performed in the work
   area, but there was no index active.

   Solution 2: Make sure that an index has been made active before
   performing the operation.