How to limit the annual use of fuel

[demar]

Hi, 

I have different transport fuels, but I want, as scenario, to limit the use of biofuels and biogas to what is only avalailable locally. 

(I will attach my VT)

Now I want to restrict the use of TRABG, TRAETH, and TRABIO, to what is available locally -- so give a maximum fuel in PJ use, like
TRABG (PJ) <= BIOGAS LOCALLY AVAILBLE (PJ)...

I have tried UC table, but when in results I look at VAR_FIN, more fuel is being used than what is available locally. 

Can someone help me?

Thanks