[GRASS-user] v.external problem vith postGIS data

[Vincent Bain]

Hi,
trying to access a polygon layer stored as a postGIS table, I ran the
v.external command (the table was itself generated by v.out.ogr). There
seems to be a problem when grass tries to build topology for the map,
and the error message is :
Random read is not supported by OGR for this layer, cannot build support

I found very few relevant information on the web for this type of error.
Has anyone coped with it yet ?

Thanks,
Vincent.