Go to your tool table... highlight the tool (T3) you want to use the different offsets...make sure you have edit on ...then insert line button..tool number T3.1 is added below the original tool...then call T3.1 with your different offset assigned to it...
Sorry it took so long to get back with you....
Here is a short example of using Datum Shifts
%234_45 G71 *
N5 G30 G17 X-900 Y-900 Z-20*
N10 G31 X+900 Y+900 Z+0*
N15 G247 Q339=+1*
N15 T3 G17 S2500*
N20 M3*
N25 G98 L500*
N25 G00 G90 X-70 Y+0 Z+10*
N30 G01 Z-1 F750*
N35 G01 X+70 G40*
N40 G00 Z+20*...
Could be a simple TOOL DEF problem, check your TOOL Table. If your using a Tool Def call without giving a radius of the tool that will give you the same error