Where it says you should not include taxes paid on wages you earned from working in wv, that does not apply to you. That is only for full year WV residents.
The fact that you got a refund from WV is not relevant. The relevant numbers are the tax you paid to WV (line 8 of WV form IT-140) and the income WV taxed (line 24 of WV Schedule A; apparently 20K). So, you enter $20K, not 0, for income taxed by WV.
