How To Fix WXP770 - Unexpected error when reading entry &1 from table t_tctrl

SAP Error Message - Details

• Message type: E = Error

• Message class: WXP - Retail Planning

• Message number: 770

• Message text: Unexpected error when reading entry &1 from table t_tctrl

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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message WXP770 - Unexpected error when reading entry &1 from table t_tctrl ?

  SAP Error Message:
  
  WXP770 Unexpected error when reading entry &1 from table t_tctrl
  
  Cause
  This warning message typically occurs in the context of SAP Web Dynpro applications or Web Application Server (WAS) when the system tries to read an entry from the internal control table t_tctrl but encounters an unexpected error. The table t_tctrl is used internally by the Web Dynpro runtime to manage control information for UI elements.
  Common causes include:
  
  Inconsistent or corrupted internal control table entries: The runtime environment might have stale or corrupted entries in t_tctrl.
  Memory or buffer issues: Temporary memory problems or buffer overflows during runtime.
  Version or patch inconsistencies: Mismatched or outdated kernel or Web Dynpro components.
  Custom code or enhancements: Custom modifications or enhancements that interfere with the standard Web Dynpro control handling.
  Transport or system copy issues: Incomplete or inconsistent transport of Web Dynpro components or system copies.
  
  
  Solution
  
  
  Check SAP Notes:
  
  Search for SAP Notes related to message WXP770 or issues with t_tctrl. SAP often provides patches or corrections for known bugs.
  
  
  Apply Support Packages / Patches:
  
  Ensure that your SAP system, especially the Web Dynpro and kernel components, are up to date with the latest support packages and patches.
  
  
  Clear Web Dynpro Cache:
  
  Sometimes, clearing the Web Dynpro cache can resolve inconsistencies:
  
  Use transaction /n/IWFND/CACHE_CLEANUP (for SAP Gateway systems).
  Or restart the SAP application server to clear runtime caches.
  
  
  
  Check Custom Code:
  
  Review any custom Web Dynpro components or enhancements that might manipulate UI controls or internal tables. Debug to see if they cause the error.
  
  
  System Health Check:  
  
  Check system logs (SM21) and dumps (ST22) for related errors.
  Verify memory and buffer settings.
  Run consistency checks on the system.
  
  
  
  Re-import or Re-transport Components:
  
  If the issue started after a transport or system copy, consider re-importing the affected Web Dynpro components.
  
  
  Contact SAP Support:
  
  If the problem persists, open a support ticket with SAP, providing detailed logs and system information.
  
  
  
  Related Information
  
  
  Transaction / Tools:  
  
  SE80 (Object Navigator) to inspect Web Dynpro components.  
  ST22 for short dumps.  
  SM21 for system logs.  
  /IWFND/CACHE_CLEANUP for cache cleanup in Gateway systems.
  
  
  
  SAP Notes Examples:  
  
  Note 1234567 (example) might address similar Web Dynpro runtime errors.  
  Always check the SAP Support Portal for the latest notes.
  
  
  
  Documentation:  
  
  SAP Web Dynpro ABAP documentation for understanding control handling.  
  SAP Kernel and Web Dynpro patch notes.
  
  
  
  
  Summary
  The WXP770 warning indicates an unexpected error reading from the internal Web Dynpro control table t_tctrl. It usually points to runtime inconsistencies, cache corruption, or outdated components. The primary approach is to update the system, clear caches, check custom code, and consult SAP Notes or support for fixes.