We quite often have to duplicate drawings and keep the dimensions as applied on that sheet. We will save as the drawing, so that the dimensions are there. But the dimension ID's are exactly the same as the original. Because of this the original drawing dimensions will become detached (Pink dims.). If you reattach the dimension on the one drawing the other drawing dimension will become detached. If the save as would repopulate the dimension ID's this would not happen. Besides this happening on component drawings it also happens on Assembly drawings when we need to copy them.