Hidden Parameters for Dynamic GL Segment Columns

You should leverage a hidden parameter that utilizes a negative display sequence number to conceal it from the user interface . This hidden parameter should be configured with a `&lexical` anchor and a SQL text that dynamically generates the required column string, based on the value of a user-facing parameter (like the selected Ledger name) . The `Report AR Transactions and Lines` serves as a good example of this, where a hidden Ledger parameter dynamically generates a string for the revenue account columns based on the chart of accounts segment setup .

To link the hidden parameter’s logic to a visible parameter, you define its Default Value using the dependent parameter syntax: `:$flex$.parameter_or_lov_name` . For example, the default value SQL could query the Chart of Accounts structure using the visible Ledger parameter name, dynamically building the SQL string for the `&lexical` anchor, ensuring the necessary column list is inserted into the main extraction SQL at runtime , .

The dynamically generated SQL text is placed exactly where you define the `&lexical` anchor within your main report query . Unlike `n=n` anchors which are confined to `WHERE` clauses, the `&lexical` anchor is versatile and can be used to insert dynamic columns directly into the `SELECT` statement (e.g., `select &columns …`) , . The system replaces the entire placeholder (`&lexical`) completely with the generated SQL text at run-time .

Yes, you should set the primary Ledger parameter as Required . The required flag enforces a value entry by the user, which prevents accidental submission of the report with insufficient parameter restrictions . If you need more complex validation than a simple required flag, you can use the ‘Advanced Required Parameters’ feature to define a logical expression (e.g., `:$flex$.ledger_name is not null`) that must be met before submission .