I have a field on a form called Car Number (main table is Profile). A user will enter a car number and then save the record. If the user finds the record and then changes the car number, programmically I would like to capture the old value of the Car number before the user changes it. Is there a standard baan variable that holds the old value or do I have to capture the old value in a variable before the user changes the car number.

You can try to use the predefined variable -

string attr.previous$(30) 4R Previous value of field.