Message type: E = Error
Message class:  OIJ_LDSCHED - TSW: Load/Discharge Scheduling Message Class 
Message number: 231
Message text: You did not enter a start date and/or end date when selecting time frame
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The SAP error message OIJ_LDSCHED231 indicates that a user has attempted to execute a function or transaction that requires a time frame to be specified, but the necessary start date and/or end date has not been provided. This error is common in various SAP modules, particularly in scheduling and planning transactions.
Cause: The primary cause of this error is the absence of required date inputs in the selection screen. When a user tries to run a report or transaction that involves scheduling or planning, the system expects the user to specify a time frame by entering both a start date and an end date. If either of these fields is left blank, the system will trigger this error message.
Solution: To resolve this error, follow these steps: Check Input Fields: Go back to the selection screen of the transaction or report where the error occurred. Enter Dates: Ensure that both the start date and end date
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