equation not evaluated
i draw a sample and add a equation. at the first equation is ok but after two or three time change the parameters the equation not evaluated. and a red sign "!" appear in the equation dialog box.
please help me
equation is "D3@Sketch1" = 300-"D2@Sketch1"
at the first I double click and modify the "D2@Sketch1"=100 after that
"D3@Sketch1"=200 is evaluated. after that if modify the "D2@Sketch1" but "D3@Sketch1" not evaluated and remain constant and and a red sign "!" appear in the equation dialog box.