| # Viewing Product Variant Structure A product variant structure defines the structure of a specific configured item by specifying the relations between this items and engineering modules that make up this item. Generic sub-items can also have their own sub-items and/or engineering modules. The level below the engineering modules is specified in the flattened assembly parts, which appears in the Flattened Assembly Parts and Operations (tiapl2520m000) session. You can only change the data in the current session if the following conditions apply: Your current company is defined as master company in the Assembly Planning Parameters (tiapl0500m000) session. You work in Test Mode, which is also defined in the Assembly Planning Parameters (tiapl0500m000) session. The Assembly Status is Open. Related topics Assembly planning overview Segment schedules |