Message type: E = Error
Message class:  FKK_ID_IT - Messages for FI-CA: VAT reporting for Italy 
Message number: 023
Message text: Period cannot cross over the fiscal year
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.
Unfortunately, there isn't any extra information in this error notice.
First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).
Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.
You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.
The SAP error message FKK_ID_IT023 indicates that a transaction or operation is attempting to process data that crosses over a fiscal year boundary, which is not allowed in certain contexts within the SAP system. This error typically occurs in the context of contract accounts receivable and payable (FI-CA) when trying to post or process items that span two different fiscal years.
Cause: Fiscal Year Settings: The fiscal year settings in the system may not allow transactions to span across fiscal years. This is often due to the configuration of the fiscal year variant in the system. Posting Periods: The posting periods for the fiscal year may be closed, preventing any transactions from being posted that would affect those periods. Transaction Type: Certain transaction types may have restrictions that prevent them from being processed across fiscal years.
Solution: Check Fiscal Year Variant: Review the fiscal year variant settings in the configuration. Ensure that the fiscal year is
 Get instant SAP help. Sign up for our Free Essentials Plan.
Get instant SAP help. Sign up for our Free Essentials Plan. 
FKK_ID_IT022 Last update was done for posting date &
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FKK_ID_IT021 Company code &1 is not Italian; you can enter only Italian comp. codes
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FKK_ID_IT024 Error while opening file &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
FKK_ID_IT025 File transferred to &1
Self-Explanatory Message Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of...
Click on this link to search all SAP messages.