In Microsoft technet Q130299, it states that CURVAL and OLDVAL will return the same value if all these are met:
- Two forms in the same Visual FoxPro session are using the same table.
- The data on one instance of the form has been modified.
- The data on another instance of the form has not been modified.

My invoice module is a formset consists of a listing form and an add/edit form. Anyone can tell me how I can allow my user to do force update when they have editing conflict? I have problem because my error handling routine's curval() and oldval() return the same value. Is there any other way of detecting a change by another network users?

Any suggestion? I am using parameterized view for my add/edit form.