I have a function in the following code that Fox interprets as an array and throws the error "invalid subscript":

Set Proc to Sysproc
Append from table.dbf for ctod2k(paydate) > dPay

Ctod2k is a function in sysproc.prg .

adte = ctod2k(paydate) works OK.

Is there a way to get Fox to recognize ctod2k as a function and not an array? Seems to only happen in a filter or a FOR... clause.
TIA