Error: An attempt was made to modify a transaction with a date that is on or before the closing date of the company. If you are sure you really want to do this, please ask a user with Admin privileges to remove the password for editing transactions on or before to closing date (this setting is in the Accounting Company Preferences), then try again. (3171)
This means that you've adjusted something in ShulCloud that was from a period that is locked in QB.
To remedy this issue, you need to either:
1) Adjust the closing date as stated in the error.
OR
2) Manually mark the transaction in questions as imported.