The Complete Message:
Circular column diameter cannot be smaller than 350 mm. (TBDY 2018 184.108.40.206)
In the article 220.127.116.11 of TBDY 2018, it is stated that the smallest cross-section dimension of rectangular columns shall not be less than 300 mm and the diameter of circular columns shall not be less than 350 mm. You are warned because this condition is not met.
Give the diameter of the circular arm, given its name and solid, at least 350 mm.
Select the circular column, columns
Click the Column Dimensions icon on the right toolbar.
In the opened Column Dimensions dialog, enter at least 175 mm in the circle column radius row.
Click the OK button.