Message type: E = Error
Message class:  HRPSGB_HER - HR PS GB Higher Education Messages (USS, HESA etc) 
Message number: 157
Message text: No occupational code is defined for job key &1 on &2
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 HRPSGB_HER157 indicates that there is no occupational code defined for a specific job key on a given date. This error typically arises in the context of Human Resources (HR) and can affect various HR processes, such as payroll, reporting, or job evaluations.
Cause: Missing Occupational Code: The primary cause of this error is that the occupational code (which is often used for classification of jobs) has not been defined for the specified job key in the system. Incorrect Job Key: The job key provided may be incorrect or not properly configured in the system. Date Issues: The date specified may not correspond to a valid period where the occupational code is defined.
Configuration Issues: There may be issues in the configuration of the HR module, particularly in the area of job classification.
Solution: Define Occupational Code: Navigate to the relevant configuration area in SAP (usually under the IMG - Implementation Guide). Go to the section
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