Improper definition of tendon property, tendon profile: The common mistakes in this dialogue box are: -Assigning inappropriate tendon material, improper tendon type. Prestressing force applied at one end or both ends 1. Consideration of time dependent properties of concrete 5. Consideration of transformed concrete section 4. Internal consideration of the software for pre-stress calculation 3. Improper definition of tendon property or tendon profile 2.