help

[glman1]

i have 5.0. under my maintain customers menu my 2000 sales and receipts are being added into my 2001. example is nov 2000 sales and receipts are showing under my 2001 yet it does not reflect on my statements. i have closed the fiscal year to see if that would take care of it but it doesnt. i did get an error at one that i believe has to do with the month of feb when we had 29 days.
can anyone HELPPPP
mary