Message type: E = Error
Message class:  IUEEDPPLOTA - Deregulation: Distribution of Aggregated Payments 
Message number: 128
Message text: Select the end of the block
Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.
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The SAP error message IUEEDPPLOTA128, which states "Select the end of the block," typically occurs in the context of data processing or data entry within the SAP system, particularly when dealing with block selection in a user interface or report.
Cause: This error usually arises when the system expects the user to define a range or a block of data but does not receive a valid selection for the end of that block. This can happen due to: Incomplete Selection: The user may have only selected the start of a block without specifying the end. Incorrect Input: The input provided does not meet the expected format or criteria for defining a block. User Interface Issues: There may be a glitch or issue with the user interface that prevents the selection from being recognized properly.
Solution: To resolve the IUEEDPPLOTA128 error, you can try the following steps: Complete the Selection: Ensure that you have selected both the start and
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