*ERR* BS scattering :no

[sdwang]

Dear Developers:
I noticed that in my BS calculation report "r_optics_bse_bss_rim_cut" there exits some error like:
[03] Transferred momenta grid
=============================

[RD./SAVE//db.kindx]----------------------------------------
Polarization last K : 23
QP states : 1 23
X grid is uniform :yes
*ERR* BS scattering :no
- S/N 008068 ---------------------------- v.03.02.01 r.448 -

My procedure as follows:
>yambo -c -b
>yambo
>yambo -c -o b -y h -V 2
>yambo

I donot kown what does the " *ERR* BS scattering :no" mean? How can I solve the problem ?
My system is 2D graphane.
Thanks!
SDWang

[Daniele Varsano]

Dear Shudong Wang,
this is not strictly an error. Yambo check in your k-points database
if they are indexed to perform a BS calculation. In the first BSE you do,
he recognize that these index are not there, and calculate it.

Cheers,

Daniele