How To Fix CT755 - Control key & is not defined (check entry)

SAP Error Message - Details

• Message type: E = Error

• Message class: CT - CIM messages: ATAB table accesses

• Message number: 755

• Message text: Control key & is not defined (check entry)

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.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message CT755 - Control key & is not defined (check entry) ?

  The SAP error message CT755, which states "Control key & is not defined (check entry)," typically occurs when you are trying to use a control key in a transaction or configuration that has not been defined in the system. Control keys are used in various SAP modules, particularly in Production Planning (PP) and Controlling (CO), to determine how operations are processed.
  Cause:
  
  Undefined Control Key: The control key you are trying to use has not been defined in the system.
  Typographical Error: There may be a typo in the control key you entered.
  Missing Configuration: The control key may not have been configured properly in the relevant customizing settings.
  Authorization Issues: In some cases, the user may not have the necessary authorizations to access or use the control key.
  
  Solution:
  
  
  Check Control Key Definition:
  
  Go to the transaction code OPL8 (for PP) or OKB9 (for CO) to check if the control key is defined.
  If it is not defined, you will need to create it using the appropriate transaction code (e.g., OPL1 for PP).
  
  
  
  Verify Entry:
  
  Double-check the control key you entered for any typographical errors.
  Ensure that you are using the correct control key for the specific process you are working on.
  
  
  
  Configuration:
  
  If the control key is missing, you may need to configure it according to your business requirements. This involves defining the control key attributes, such as its usage, allowed operations, and other relevant settings.
  
  
  
  Authorization Check:
  
  Ensure that you have the necessary authorizations to access and use the control key. If not, contact your SAP security administrator to grant the required permissions.
  
  
  
  Consult Documentation:
  
  Refer to SAP documentation or your organization's internal guidelines for the correct usage of control keys in your specific context.
  
  
  
  Related Information:
  
  Control Key Usage: Control keys are used to define how operations are processed in production orders, such as whether they are to be scheduled, confirmed, or have costs assigned.
  Common Control Keys: Some common control keys include "PP01" for production orders, "PP02" for process orders, and others specific to your organization's configuration.
  Transaction Codes: Familiarize yourself with relevant transaction codes for checking and configuring control keys, such as OPL1, OPL8, OKB9, and others.
  
  If the issue persists after following these steps, it may be beneficial to consult with your SAP support team or a functional consultant who specializes in the relevant module.