Creating Recurring Invoices that utilize due date as invoice number?

SUGGESTED

We are an apartment rental company and utilize Sage 50 as a way to keep track of monthly rents.  We were creating recurring invoices and manually changing the invoices to FH 1 May 2019, FH 1 June 2019, etc.  However we have almost 500 units and this can be very time consuming.  We tried to have Sage automatically create the invoice number but it would just go to the next logical invoice number FH 1 May 2020, FH 1 May 2021, etc.  (The FH 1 designates the apartment)  Does anyone know of a solution to this problem?  Any suggestions would be greatly appreciated.