Message type: E = Error
Message class: FMCA_BRF - FMCA -> BRF Interface
Message number: 018
Message text: Enter an index or aggregate function
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The SAP error message FMCA_BRF018, which states "Enter an index or aggregate function," typically occurs in the context of Business Rule Framework (BRF+) when a user is trying to define a rule or expression that requires an index or an aggregate function but has not provided one.
Cause: Missing Function: The error usually arises when a user attempts to use a data structure (like a table or an array) without specifying how to access its elements. For example, if you are trying to retrieve a specific value from a table, you need to specify an index or an aggregate function to do so. Incorrect Syntax: The syntax used in the expression might be incorrect or incomplete, leading to the system not being able to interpret the request properly. Data Type Mismatch: The data type being used may not support the operation you are trying to perform, which can lead to this error.
Solution: Specify an Index:
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