Sell same item category on different BSA lines with overlapping dates

Hi, we have the need to sell the same item with different price lists on separate blanket sales agreement lines with the same date ranges.  To handle this we've used item cross references.  We now want to sell by Item Category instead of specific item, but the blanket will not allow as the date ranges are the same.  Looking for any ideas on how you can have sell from the same item category on different BSA lines/different pricelists with the same date ranges, any ideas would be great!

The error received is "Sales Agreement line already exists for this item with the same effectivity dates.