Hi Cy
>

>FUNCTION SCOPE (cDbf,cField,xStart,xEnd)
>LOCAL lcFilterString
>SELECT (cDbf)
>DO CASE
>
>   CASE TYPE("xStart") = "D"
>      lcFilterString = "set filter to between("+cField+",{"+DTOC(xStart)+"},{"+DTOC(xEnd)+"})"
>   CASE TYPE("xStart") = "C"
>      lcFilterString = "set filter to between("+cField+",'"+xStart+"','"+xEnd+"')"
>   CASE TYPE("xStart") = "N" OR TYPE("xStart") = "I"
>      lcFilterString = "set filter to between("+cField+","+xStart+","+xEnd+")"
>ENDCASE
>*-- Set the filter on selected table
>&lcFilterString
>ENDFUNC
>

When I use scope("year","date", {^2001-01-01}, {^2001-30-01})
Your function returns
&lcFiltering = set filter to between(date,{01/01/2001}{30/01/2001)
and returns an error