As of the 2015.i version, Arquimedes allows users to eliminate a supplier from a purchase comparative whilst all the supplies in the comparative have not yet been contracted. To do so a new button has been included in the program: "Delete selected element of the list" (Job control > Purchase management > Purchase comparatives > select a comparative whose supplies have not all yet been contracted), which deletes a supplier from the suppliers list.
The option is useful because as offers are introduced, suppliers are directly discarded. If the discarded suppliers are not eliminated, the data will continue to appear in the reports.