Creo ModelCHECK > checks > SHTMTL_FLAT (Sheet Metal Flat Patterns or Flat States)
  
SHTMTL_FLAT (Sheet Metal Flat Patterns or Flat States)
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Checks for the existence of flat patterns or flat states in sheet metal parts.
A flat state is a completely unbent copy of your part. It streamlines the creation of flat patterns needed in manufacturing. You can create any number of flat states, at any time in your design process, whether your part is fully formed or fully flat. Flat states are managed with family tables.
A flat pattern is a feature that shows the model in its flat state. It is always positioned as the last feature. When new features are added, the flat pattern automatically moves to the end of the feature list. Flat patterns allow you to start working on drawings before the sheet metal part is finished.
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