>>>>It works, just type to controlsource '0+ttod(table.field)'. It will make this trick.
>>>
>>>Hi Edward,
>>>
>>>It worked perfectly!! Thanks!!!! Now, I don't understand why it worked. What difference did the 0+ make? How? Thanks again for the help.
>>
>>It forces VFP to perceive it as expression, just a trick nothing else.
>Gee Ed,, How do you find these tricks??
>Mark Oliva

Firstly, I got error message in similar situation (some time ago), and then figured out how to make it work. Usually, error crosses when expresion is built in code and does not appear if typed directly to property sheet.