BWART field not in Field catalog

I want to use a specific movement type for output determination. The field I need is BWART and it is table 499

I am going to use table 499 in an access sequence

As you see, feld BWART is not available for selection

I have added the field in table KOMB

and I can see it also in table V_T681F

So how come I can still not see field BWART in the field catalog?

Thanks in advance