Message type: E = Error
Message class:  RMSA1 - RMS-ATL: Messages 
Message number: 269
Message text: Key date &1 and no change number are used
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The SAP error message RMSA1269 indicates that there is an issue with the key date and the absence of a change number in the context of a specific operation, typically related to the Resource Management or similar modules in SAP.
Cause: The error occurs when a user attempts to perform an operation that requires a key date and a change number, but either: The key date provided is not valid or does not correspond to a valid change number. A change number is not specified when it is required for the operation.
Solution: To resolve the RMSA1269 error, you can take the following steps: Check Key Date: Ensure that the key date you are using is valid and corresponds to the relevant data in the system. The key date should be within the range of dates that are relevant for the operation you are trying to perform. Specify Change Number: If the operation requires a change number, make
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