tecplot doesnt recongise grid boundary in external flow

The Precipitation boundary condition can be applied directly to any 2D flow area as a time series of rainfall excesses. There are two types of internal boundary conditions that can be used in HEC-RAS: If a cell is dry and the stage boundary condition is lower than the 2D flow area cell minimum elevation, then flow will not transfer. For the Stage Hydrograph, stages higher than the ground or water surface in a 2D flow area will send flow in, and stages lower than the water surface in the 2D flow area will send flow out. For a Flow Hydrograph, positive flow values will send flow into a 2D flow area, and negative flow values will take flow out of a 2D area.

The flow and stage hydrograph boundary conditions can be used for putting flow into or taking flow out of a 2D flow area. The Normal Depth and Rating Curve boundary conditions can only be used at locations where flow will leave a 2D flow area. There are four types of external boundary conditions that can be linked directly to the boundary of 2D Flow Areas, these are:

Boundary conditions consist of external boundary conditions along the perimeter of the 2D area, internal boundary conditions, and global boundary conditions (Meteorological Data ) that are applied to the entire model (i.e., precipitation, wind, etc.). HEC-RAS has a wide range of boundary and initial conditions that can be applied to a model.

Tecplot doesnt recongise grid boundary in external flow