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How To Fix FDT_EXPRESSIONS579 - Comparison requires same or compatible type (position &1)


SAP Error Message - Details

  • Message type: E = Error

  • Message class: FDT_EXPRESSIONS - Formula & Derivation Tool: Expressions

  • Message number: 579

  • Message text: Comparison requires same or compatible type (position &1)

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  • 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 FDT_EXPRESSIONS579 - Comparison requires same or compatible type (position &1) ?

    The SAP error message FDT_EXPRESSIONS579 indicates that there is a type mismatch in a comparison operation within a formula or expression in the SAP system. This typically occurs when you are trying to compare two values that are not of the same data type or are not compatible for comparison.

    Cause:

    The error is caused by one of the following scenarios:

    1. Data Type Mismatch: You are trying to compare two different data types (e.g., comparing a string with a number).
    2. Incompatible Types: The types being compared may not be directly compatible, even if they seem similar (e.g., comparing a date with a string representation of a date).
    3. Null Values: One of the values being compared may be null or undefined, leading to an invalid comparison.

    Solution:

    To resolve this error, you can take the following steps:

    1. Check Data Types: Review the data types of the values being compared. Ensure that both values are of the same type or are compatible for comparison.

      • For example, if you are comparing a numeric field with a string, convert the string to a number or vice versa.
    2. Use Type Conversion Functions: If necessary, use type conversion functions to convert one of the values to the appropriate type before performing the comparison.

      • For example, use TO_NUMBER() to convert a string to a number or TO_STRING() to convert a number to a string.
    3. Handle Null Values: Ensure that neither of the values being compared is null. You can use conditional checks to handle null values appropriately before performing the comparison.

    4. Review the Expression Logic: If the comparison is part of a larger expression or formula, review the entire logic to ensure that all parts of the expression are valid and compatible.

    5. Debugging: If you are unable to identify the issue, consider using debugging tools or logs to trace the values being compared at runtime.

    Related Information:

    • SAP Documentation: Refer to the official SAP documentation for more details on data types and expressions in the context of your specific SAP module.
    • Community Forums: Check SAP community forums or support channels for similar issues and solutions shared by other users.
    • SAP Notes: Look for any relevant SAP Notes that might address this specific error or provide additional guidance.

    By following these steps, you should be able to identify and resolve the cause of the FDT_EXPRESSIONS579 error in your SAP environment.

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