Updateable BAQ with UNION

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You need to use Advanced BPM and code it for yourself.

Fortunately that isn’t quite as big a task as it sounds, because you can cheat by using the code Epicor creates for you. If you create a standard BAQ for each table singly, you can copy the code from those into a new blank Custom Code widget in your Union BAQ with Advanced BPM Update.

Here’s another thread where similar is discussed: