Use Multilookup to retrieve a set of values from a dataset for name-value pairs where each pair has a 1-to-1 relationship. ...

Use Multilookup to retrieve a set of values from a dataset for name-value pairs where each pair has a 1-to-1 relationship. MultiLookup is the equivalent of calling Lookup for a set of names or keys. For example, for a multivalue parameter that is based on primary key identifiers, you can use Multilookup in an expression in a text box in a table to retrieve associated values from a dataset that is not bound to the parameter or to the table.