Do you use the Required property on a field?
The Required property of a field determines whether the field will allow null values after upsizing. If Required is set to Yes in Microsoft Access, the upsized field will not allow null values. If Required is set to No, null values are acceptable.
Do you use the AllowZeroLength property on a field (Upsizing Problem)? Do you use the Caption property on a field (Upsizing Problem)? Do you have invalid DefaultValue and ValidationRule properties (Upsizing problem)? Do you use the Format and InputMask properties on a field? Do you use a unique index and the Required property on a field? Do you have valid ValidationText property(Upsizing problem)?