Message type: E = Error
Message class: SY - ABAP/4 system messages
Message number: 491
Message text: Internal tables and strings do not have instances
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SY491
- Internal tables and strings do not have instances ?The SAP error message SY491 ("Internal tables and strings do not have instances") typically occurs in ABAP programming when there is an attempt to access an internal table or a string that has not been properly instantiated or initialized. This error can arise in various scenarios, such as when trying to read from an internal table that has not been filled with data or when trying to manipulate a string that has not been defined. Causes: Uninitialized Internal Table: The internal table has been declared but not filled with any data before it is accessed. Uninitialized String: A string variable is declared but not assigned any value before it is used. Incorrect Logic: The logic in the program may lead to a situation where the internal table or string is expected to have data, but it does not. Scope Issues: The internal table or string may be declared in a different scope and is not
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