No same value in 2 Potentials

No same value in 2 Potentials

hi there,
I have 2 Potentials in 1 Account, and I have a field called sequence, then I need to make sure this field has 2 different value in 2 Potentials.
e.g: the first created potential should have 1st in sequence field, and then the second potential only can have other values in this field.

thanks!