The GetParameterEquation command retrieves the equation associated with the specified parameter.

$\mathrm{with}\left(\mathrm{CAD}\left[\mathrm{Inventor}\right]\right)\:$

$\mathrm{OpenConnection}\left(\right)\:$

$\mathrm{doc}≔\mathrm{GetActiveDocument}\left(\right)\:$

$\mathrm{GetParameterEquation}\left(\mathrm{doc}\,''d1''\right)$

$''d1\; =\; p1\; *\; 2\; ul''$

$\mathrm{CloseConnection}\left(\right)\:$