Question:

When analyzing a model the following warning number was reported. 

233 - CHECKING DATA : Maximum total deflection under wind action = H/240 , by default (Operating).

Why and how to avoid it?

Answer: 

The maximum allowable deflection at the top of the vessel is set to H/240 (H = height of the vessel) by default when the user did not input a value (blank field).
The calculation program will increase the thicknesses along the vessel wall to meet this value. 

Avoidance:

Enter a value of maximum deflection.