US-China Treaty Article 20B for F1-OPT

Hi,

 I am a Ph.D. student already been in the US for 8 years (resident alien) and currently working in an institute receiving fellowship with F1-OPT. My situation is unlike most questions regarding the treaty Article 20C, where you can put $-5000 in the Other Reportable Income and file a Form 8833 to IRS. 

For the Treaty Article 20B, what should I do?