I index cursors all the time so this surprises me today. The error message states: "File must be opened exclusively".

I even set exclusive on, recreated the cursor and then tried the indexing again, but received the same error message.

Here's the simple SQL statement and INDEXing command:

SELECT * ;
	FROM GRPEXTCV ;
	INTO CURSOR tmpGRPEXTCV

SELECT tmpGRPEXTCV
INDEX ON GrpID+GrpNum+PlanKey TAG FULL_KEY