[GRASS-user] why v.patch -e produces cat column starting from 2?

[Nikos Alexandris]

On Wed, 2008-11-12 at 15:50 +0100, Moritz Lennert wrote:
> On 12/11/08 15:05, Nikos Alexandris wrote:
> > On Wed, 2008-11-12 at 14:44 +0100, Nikos Alexandris wrote:
> >> On Wed, 2008-11-12 at 05:35 +0100, Nikos Alexandris wrote:
[...]
> 
> There is a fundamental problem with '-a' if the cat numbers in the two 
> maps are overlapping, but the attributes linked to these overlapping 
> numbers are different in the two maps:
> 
[...]
> 
> => attributes 'ten' and 'twenty from map are gone since key fields have 
> to be unique in attribute tables
> 
> So, unless you are sure that there are not overlapping cat's in the maps 
> you are planning to patch, steer away from '-a'.
> 
> Moritz

OK, even more clear now.