Paul,

This is a follow up to my previous response. It turns out that both your solution and my suggestion suffer from the same problem when the issue Sergey pointed out (Q247494) gets involved. Here's the code:

FOR i = 1 TO 3 step .1
   debugout PaulRound(i, 15)
   debugout round( val( transform(i)), 15)
ENDFOR

FUNCTION PaulRound( tnNumber, tnDecimals)
RETURN round(val(alltrim(str(tnNumber,20,tnDecimals+1))),tndecimals)

At 1.6 both start returning 1.600000000000001, 1.700000000000001, etc. At 2.7 the error moves to 2.700000000000002, 2.800000000000002, etc. Moreover, TRANSFORM itself is not the problem, since using

round( val( alltrim( str( i, 17, 15))), 15)

instead of TRANSFORM gives the same error.

This needs some more study, IMO.