"The date cannot be part of a different fiscal year".

This error will display if there is another year with the same periods in it. To resolve this go through the years already setup in the Fiscal Periods window and take note of the "culprit" year.

Go to SQL and run the following statements on the database:

delete sy40100
where year1=20**
delete SY40101
where YEAR1=20**
delete sy40102
where year1=20**
delete SY40103
where YEAR1=20**

please repalce 20** with the "culprit" year. The year  I am referring to is the field titled "Year" as seen in the Fiscal Period Setup window screen shot below.

PLEASE DO NOT DELETE IF YOU HAVE TRANSACTIONS POSTED FOR THE PERIODS LISTED UNDER THAT YEAR.