Retirement tax questions

Thank you @Opus 17 in my case its post tax non deductable traditional IRA. So based this there should not be any problem with investing into traditional IRA even with rollover IRA account. The only thing is, when I withdraw the money it will calculate the taxes based on Pro rata rule as this will have post tax and pre tax. As long as I file 8606 every year it should not cause any issue. Right?