rezzing object relative alignment.

im having a problem getting one object to rez another object above it in the correct position.
if the first object is at zero rotation the rezzed object is correctly aligned, but if it is rotated in any direction the rezzed object always appears 0.5m less in the x direction ( x if it was at zero rotation).
it does appear correct in the y and z axis and in rotaion.

i have tried adding another transparent prim to the rezzed object so that both objects have the same x,y,z location when they are aligned,
I cant figure out where Im going wrong

You neet to rotate the offset.
Multiply offset by llGetRot()

vector offset = < 1,1,0>;
vector speed = <5,0,0>;
rotation rot = llGetRot();
integer number = 0;
llRezObject("object", llGetPos() + offset*rot,speed*rot,rot,number);

Thanks