I've developed a fairly simple spreadsheet for the purpose of collecting
information. In the worksheet are several pull-down lists created using the
datavalidationlist function in Excel. Based on the selection in one of
pull-down, other pull-down list source ranges will be adjusted.

Everything works fine when the worksheet is unprotected, but when I protect
the worksheet I get the following error message:

Run-time error '1004';
Application-defined or object-defined error

The code generating the error is:

Range("B19").Validation.Modify xlValidateList, xlValidAlertStop, xlBetween,
"=$L$6:$L$12"

Cell B19 is a pull-down list created using the toolvalidation function and
being adjusted using the above VBA statement and "=$L$6:$L$12" is the new
list source lookup range.

Any help with the problem will be appreciated.

Thanks in advance.