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A qualified data reference (QDR) is a way of limiting one or more dimensions of a data object to a single value. QDRs are useful when you want to specify a single value of a data object without changing the current status. Using a QDR, you can qualify a dimension (which enables you to specify one dimension value in an expression) or one or more dimensions of a variable or relation.
Sometimes the syntax of a QDR is ambiguous and could either be misinterpreted or cause a syntax error. In this case, you can use the QUAL function to explicitly specify a qualified data reference (QDR).