Forum Post: Is there any way to setup Bill Messages to appear conditionally or on a certain invoice?

I noticed that custom bill messages can be set to appear on a set number of bills. Also, it appears the Charges Due message can change depending on how old a balance is. What I'd like to do is set up a certain message to appear on the first invoice a client gets and then a different message to appear on the second invoice. From all I can see I can only do the opposite. Does anyone have any idea if this is possible? Thank you