How To Fix /SAPAPO/SDP129 - History cannot be entered in book, you cannot save data

/SAPAPO/SDP129 - Overview

• Message type: E = Error

• Message class: /SAPAPO/SDP -

• Message number: 129

• Message text: History cannot be entered in book, you cannot save data

Self-Explanatory Message

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.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

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/SAPAPO/SDP129 - Details

• The SAP error message /SAPAPO/SDP129 indicates that there is an issue with entering historical data in the SAP Advanced Planning and Optimization (APO) system, specifically in the context of the Supply Network Planning (SNP) or Demand Planning (DP) modules. The message "History cannot be entered in book, you cannot save data" typically arises when there are constraints or settings that prevent the saving of historical data.
  Causes:
  
  Data Locking: The data book may be locked for editing, either due to a user lock or a system lock.
  Incorrect Configuration: The configuration settings for the planning book or data view may not allow for historical data entry.
  Time Period Issues: The time period for which you are trying to enter historical data may be closed or not available for editing.
  Authorization Issues: The user may not have the necessary authorizations to enter or modify historical data.
  Data Integrity Issues: There may be inconsistencies or errors in the