I've got a problem with using constrained geometry which I just can't figure out. I was hoping someone could maybe shed some light on this situation for me. here's the details.
I have created the attached file, which I have been using to generate a cutting guide for folding corrugate cardboard boxes of varying dimensions. If you open the file up and have a look in the calculator panel, you'll see that there are L, W, H and BoardThick constrained dimensions. The idea being that if you type in the relevant internal dimensions of the box you want, and the thickness of the board, then Turbocad will draw a box with the panels dimensioned appropriately.
To quickly explain how the file works, there is an invisible layer named 'backing' which contains a centre line and all of the contrained boxes, which are aligned symetrically around the centre. These boxes change dimensions as different values are typed into the calculator panel. On layer 0 are a series of black and red lines (to Illustrate cuts and folds) which are aligned to the boxes on the hidden layer. As such, when you enter values into the calculator panel the hidden boxes are resized, and the visible lines (which make up what I actually want to print out) snap to them, giving you a perfect box cutter.
The file, although a little complex, does actually work pretty well, however i wanted to edit it in order to add four slots into the base panel (2 per side) rather than the current two slots. However, every time I draw a new box or line and try constrain it to the existing geometry I'm given the error message 'Invalid operation: Selected entities have different coordinate system'
As far as I can tell there are no differences between any of the coordinate systems so Im at a loss of what to do! Ive checked all of the properties and I cant see anything that is different between the two components. Im completely stumped! Does anyone have any ideas about what I might be doing wrong?