Message type: E = Error
Message class:  FIRU_CNT - Contract Accounting 
Message number: 005
Message text: Contract End Date has not to be before Contract Start Date
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The SAP error message FIRU_CNT005 indicates that there is a problem with the contract dates in the system. Specifically, it means that the end date of a contract is set to a date that is earlier than the start date, which is not allowed.
Cause: Incorrect Date Entry: The most common cause is that the user has mistakenly entered the end date before the start date when creating or modifying a contract. Data Migration Issues: If data has been migrated from another system, there may be inconsistencies in the date fields. System Configuration: In some cases, system settings or configurations may lead to unexpected behavior regarding date validations.
Solution: Check Dates: Review the contract details and ensure that the end date is set to a date that is equal to or later than the start date. Navigate to the contract in question and verify the start and end dates. If the end date is incorrect, update it to
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