Based on what you have said, so far I think it is you.  But I don't think your message really described what you problem is.  So it may be the program, but you have to give us more information about what is going on.

First.

punkerdoo said:

Our year end is nov 30, my system won't let me make the period start nov 28 (which is actual)

By definition of a year, if one ends Nov 30, then next must begin on Dec 1 so there is no bug in the system here.  If your year end is really Nov 27, your last year should have ended Nov 27 not Nov 30, and your new year will start Nov 28.  So again, no bug here, just user data entry problems.

But since the rest of your message indicates payroll, are you really talking about transitioning between fiscal year ends or cutting payroll payroll cheques with start and end periods that just happen to cross a year end?  If the latter, you need to provide more information about what is going on to let us test the same scenario.

1) Which version of the program are you running 2021.1, 2021.0, 2020.3?

2) What is your session date?

3) What is the actual period start and end dates?

4) What is the cheque date?

5) What is the exact text of your error message?

I just tested 2020.3 in a sample file and entered a period start date and current year end date and it didn't complain when I posted.

yes it is the latter, 

1) 2021.0

2) session date is dec 1/2020 (forces it to that once you start a new fiscal year)

3) period start date was nov 28, period end date was dec 12

4) cheque date is dec 18

5) invalid date. the period start date must be between 12/01/2020 and 12/31/2021 (this message particularly makes me think glitch because it won't let me choose november because it thinks its not within this fiscal, but it will let me choose a december date that falls AFTER my NEXT fiscal end?? thirteen months away, that's odd)

and in response to your trying it in 2020.3, i agree, i have never seen this error before in any of my year ends so i think this is something that was overlooked in the 2021.0 (in fact last pay date was dec 4 which both dates fell in prior year end period and i posted that in 2020.3 and no issue)

In Image 1 from Sage 50 2021.0 below you can see the test file I set up with the fiscal years, session date and the latest transaction date after I posted the payroll cheque.

Image 2 shows the cheque and the only warning message I got before it posted.

Sorry but it seems to be working for me assuming I got your settings correct.

Image 1

Image 2

ok.... i have figured out the problem, in the settings tab i have checked not to allow transactions before 12/01/2020. 

HOWEVER, i have always done this... AND... this transaction isn't being posted on 11/28 (pay start date). that field should be excluded from the rule since it isn't a posting field. it's really just informational