The Enforce Bounds In CALC and DATA checkbox on the General Solver tab:

causes LINGO to check the values of any variables input in calc and data sections against their bounds.  Normally, variable bounds apply only to optimizable variables that appear in the model's constraints and not to variables fixed to constant values in calc and data sections.  If you would also like LINGO to check variables fixed in calc and data sections against their bounds, then you will need to enable this option.

By default, this option is disabled.