Now I'm getting this:

Record 1 with key AN1.25MST ignored because 'add new records?' is turned off.

Record 2 with key AN1.25MST16G ignored because 'add new records?' is turned off.

Record 3 with key AN1.25X5MST ignored because 'add new records?' is turned off.

Record 4 with key AN1.5MST ignored because 'add new records?' is turned off.

Record 5 with key AN1.5MST16DELHI ignored because 'add new records?' is turned off.

Record 6 with key AN1.66MST-3 ignored because 'add new records?' is turned off.

etc..

The strange thing is that these are all existing codes on our system.