Error using v.support

[N R A]

I've managed to import some vector data OK - drawing the lines everything 
seem fine.
Next I wanted to add the labels to them - to do this I have created a 
file with each line in the format "L 999999 999999 cat" as discussed in
the programmers guide. Place that file (with the same name as the vector) 
in the 'dig_att' directory and then run 'v.support' - I then get a number 
of lines of the form 'WARNING: line xx label ... matched another label 
....' - thing is I've looked at the two lines and can't see how they 
match - the 
coordinates look different and the label is just a unique identifier

Can anyone cast any light on what is going on.

Thanks,

Steve Culshaw
NRA North West
e-mail : nra at cix.compulink.co.uk (use this for general usage)
or         sculshaw at cix.compulink.co.uk (Private - only checked at best 
biweekly)