AutoNumber(recno(),Ref) as Count ? how it works pls

[#1]

AutoNumber(recno(),Ref) as Count    how  it is calcilating   pls

TEST:

LOAD * INLINE

[

Ref, Amount, Date

ABC, 100, 01/01/2012

ABC, 100, 01/01/2013

ABC, 150, 01/01/2014

BCD, 200, 15/01/2013

BCD, 225, 15/01/2014

CDE, 300, 20/01/2014

DEF, 300, 06/04/2012

DEF, 275, 06/04/2013

EFG, 200, 08/08/2013

FGH, 225, 10/12/2013

];