I have never done this before, but it seems that functions of order Z (in the Move menu - back, forward, etc.) are not available for lines or images, and it seems that the order of the image z is always above the line, even if you have multiple sections and use the "underlay following sections" option.
My answer is that it is impossible to do the way you are trying to do it, but what if you try a different way.
EDIT: I assume that you are trying to create a strike in the image in certain cases. Assuming you should have 2 images (one normal and one with a line through it), which then should be dynamically changed depending on your criteria. You should find many articles on dynamically changing Crystal Report images. Hope this helps.
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