Message type: E = Error
Message class:  TXILM - ILM Messages 
Message number: 221
Message text: Structure &1 does not contain a currency key field for &2
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The SAP error message TXILM221 indicates that a specific structure does not contain a currency key field, which is required for certain operations, particularly those involving currency conversion or financial transactions. This error typically arises in the context of customizing or configuring financial applications within SAP.
Cause: The error occurs when: A structure (denoted as &1 in the error message) is expected to have a currency key field, but it does not. The operation being performed (denoted as &2 in the error message) requires a currency field to process financial data correctly.
Solution: To resolve this error, you can take the following steps: Check the Structure Definition: Go to the Data Dictionary (transaction SE11) and check the structure mentioned in the error message (&1). Verify if there is a currency key field defined in the structure. Common currency fields in SAP include WAERS (Currency Key). Modify the Structure: If the currency key field is missing, you may need to add it
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