Radiant and Diamond: HDL pin constraints not seen in Spreadsheet View/Device Constraint Editor

Radiant and Diamond: HDL pin constraints not seen in Spreadsheet View/Device Constraint Editor

Description:
In Lattice Radiant and Diamond, while using the Spreadsheet View/Device Constraint Editor, it is possible to not see the HDL pin constraints reflected in GUI.

Solution:
This may be because the pins mentioned in the lines of code have been optimized by the tool.

See the following warnings: