Message type: E = Error
Message class:  SV - View Maintenance: Customize Messages 
Message number: 764
Message text: Data record selection was changed.
There is a line-related authorization for this maintenance object.
Depending on your authorization, it is possible that different data
records are displayed in display mode and change mode.
If you want to change data records but do not have the relevant
authorization or cannot display the necessary data records, you must
contact your system administrator.
Authorizations at line level are maintained using the authorization
object S_TABU_LIN.
Error message extract from SAP system. Copyright SAP SE.
The SAP error message SV764, which states "Data record selection was changed," typically occurs in the context of data selection or processing in SAP systems, particularly when dealing with data records in reports or data extraction processes. This error can arise due to various reasons, and understanding the cause and potential solutions can help in resolving the issue.
Cause: Data Record Changes: The error often indicates that the selection criteria for data records have been modified after the initial selection was made. This can happen if the underlying data has changed or if the selection parameters were altered during the execution of a report or transaction. Concurrency Issues: If multiple users are accessing or modifying the same data records simultaneously, it can lead to inconsistencies in the data selection. Authorization Issues: Sometimes, changes in user authorizations or roles can affect the ability to access certain data records, leading to this error. System Configuration: Incorrect configuration
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