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Every Query must have a Data Source. That is where the information is going to come from. Even though a Data Source can have Names or Fields that get information from yet other Data Sources, there is still always a 1st and primary Data Source. This Data Source we can lookup from the available Data Sources that are enabled for Query Builder.

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The Data Selector is always one that works with the specified Data Source. If we change the Data Source, then we have to re-select the Data Selector as well.

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And the same for the Data Fields. They are bound to the Data Source.

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The moment we select a new Data Source, we lose our Data Fields and Data Selector choices, because they were bound to the prior Data Source. Therefore, we have to re-select those.

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