I think that May 16, 2004 code (pretty old) came before DT_INTS. I still don't know where you found it. Your error is from all the wsaves in the Multi_SPWM.pbp include file. So simply edit them to be:
Code:
;wsave       var byte    $20     SYSTEM          ' location for W if in bank0 
wsave       var byte    $70     SYSTEM          ' location for W if in bank0 
' --- IF any of these three lines cause an error ??  
'Simply Comment them out to fix the problem ---- 
;wsave1      var byte    $A0     SYSTEM          ' location for W if in bank1 
;wsave2      var byte    $120    SYSTEM          ' location for W if in bank2 
;wsave3      var byte    $1A0    SYSTEM          ' location for W if in bank3 
' ------------------------------------------------------------------------------
if you are not going to specify it in your code.