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In Parameters, a convenient feature was created to Link with Selected Datasources. This feature is enabled when you have a parameter of the same name and type in more than one datasourcedata source. When you link a normal parameter with multiple datasourcesdata sources, they will remain linked until the user unlinked them manually.
Keep in mind that for parameters that are part of a query, the link is NOT permanent, you will have to execute the "Link with Selected Datasources" action every time you want to generate the modified parameter value to other datasourcesdata sources.
See the Parameters page for more on how to create and modify Parameters.
