Create an Attribute View:Customer:Tables: KNA1, T005T, T005U.

Semantics View:

Add the tables by hovering the mouse on the data foundation and add the tables KNA1, T005T,T005U.

Join the tables . Make KUNNR as the key attribute.

Select the field KUNNR from the Details View, + Shift + KUNNR from the output selection and make the Key Attribute to true from the Properties pane.

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