Message type: E = Error
Message class:  SAWE_BO_SA_TIME_PS - Message Class : Staff Assignment Time Planning Sheet 
Message number: 050
Message text: Assignment validity starts on &1; start sate &2 cannot be less than &1
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The SAP error message SAWE_BO_SA_TIME_PS050 indicates that there is an issue with the assignment validity dates in a business object (BO) related to time management or personnel assignment. Specifically, the error states that the start date of an assignment cannot be less than the validity start date.
Cause: This error typically occurs when: You are trying to create or modify an assignment (such as a personnel assignment) with a start date that is earlier than the defined validity start date for that assignment. There may be a mismatch between the dates entered in the system and the expected date ranges defined in the configuration or master data.
Solution: To resolve this error, you can take the following steps: Check Validity Dates: Review the validity start date (&1) for the assignment you are trying to create or modify. Ensure that the start date (&2) you are entering is not earlier than the validity start date. Adjust Dates: If the start date is
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