Message type: E = Error
Message class:  BW_BICS_EQ - Easy Query Messages 
Message number: 018
Message text: One or more required variables in query &1 have not been defined
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The SAP BW error message BW_BICS_EQ018 indicates that one or more required variables in a query have not been defined. This typically occurs when a query is executed without providing the necessary input for certain variables that are marked as mandatory.
Cause: Missing Variable Values: The query has variables that are set as mandatory, but the user did not provide values for these variables when executing the query. Incorrect Variable Configuration: The variables may not be properly configured in the query definition, leading to the system not recognizing them as defined. Authorization Issues: Sometimes, the user may not have the necessary authorizations to access certain data, which can lead to the system not being able to resolve the variables. Query Design Issues: The query might have been designed incorrectly, where the variables are not linked properly to the data source.
Solution: Provide Required Variable Values: When executing the query, ensure that all mandatory variables are filled in
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