Message type: E = Error
Message class:  FOT_B2A - Messages Administration Report Electronic Data Transmission 
Message number: 413
Message text: Delimited period does not begin on first day of month
You have chosen the update of data for the electronic return for tax on
sales/purchases. In this case, the delimited period must match the
legally required settlement period exactly.
The system cannot execute the taxes on sales/purchases settlement within
electronic communication with authorities.
The system issues an error message and will not allow you to continue with this transaction until the error is resolved.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message FOT_B2A413 indicates that there is an issue with the date range specified in a financial transaction or report. Specifically, the error states that the delimited period does not begin on the first day of the month. This typically occurs in scenarios where a date range is expected to start on the first day of a month but does not.
Cause: Incorrect Date Range: The date range specified in the transaction or report does not start on the first day of the month. For example, if the date range is set from March 5 to March 31, it will trigger this error.
Configuration Issues: There may be configuration settings in the SAP system that enforce this rule, particularly in financial reporting or month-end closing processes. User Input Error: The user may have inadvertently entered a date range that does not conform to the expected format.
Solution: Adjust the Date Range: Modify the date
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