Trying to find the name of another case!...

[MrBenjy]

Firstly, thank you Jenna, it was indeed Clayton's Case. But I suppose what I'm looking for (and, again, try as i might, cannot find) is a case that is an exception to Clayton. i.e. a case where it was held that where a debtor appropriates a payment for a specific debt, i.e. allocates a payment for a specific invoice, the payment can only be used as appropriated and not used to settle other debts. Now from the days of my law degree, when they used latin, i remember the maxim 'solvitur in modum solventis'. But I need a case to back this up. I cannot find such a case. Anyone happen to know one?