I have a list of the Pfalz Flugzeugwerke G.m.b.H. Speyer am Rhein for Pfalz models: 
  
Pfalz A I GA,DF,DM,
Pfalz A II GA,DM,
Pfalz C I GA,
Pfalz D Typ GA,
Pfalz D I DF,
Pfalz D II DF,
Pfalz D III GA,DM,WS
Pfalz D IIIa GA,DM,WS
Pfalz D IV DF,
Pfalz D VI GA,DF,
Pfalz D VII GA,DF,
Pfalz D VIII GA,DF,DM,
Pfalz D XII GA,DF,DM,WS
Pfalz D XIV GA,DF,
Pfalz D XV GA,DF,
Pfalz D XVf GA,
Pfalz D Experimental GA,
Pfalz Dr Experimental GA,
Pfalz Dr I GA,DF,DM,
Pfalz E I GA,DF,WS
Pfalz E II GA,DF,DM,WS
Pfalz E III GA,DF,DM,WS
Pfalz E IV GA,DM,WS
Pfalz E V GA,DM,WS
Pfalz E VI DM,WS
 
However, I can't find a picture of the D I for comparison. (if it was intended instead of "BI")
 
Anyone with better skills than I think it's possible that it's another model or plane type?