I believe this task gives wrong reward.
Currently it gives bill of sale while it should give you region map. Absolutely no logic why it rewards bill of sale.
There is no way to upgrade local maps into region maps right now while there is task to upgrade region maps into district map.
Chiming in to confirm this. It's not just something wrong with the description - completing the task awards a bill of sale, not a district map.
In addition to not having a common way to obtain district maps, this bugged mission is also a strictly superior way to obtain bills of sale. It needs no weapon, takes 4 hours less than the "protect market" task, but has the same rewards, Factoring in the tasks required to obtain local maps, it takes 1 hour less assuming a single slot, and has much greater rewards.
Comments
It makes no sense to get bills of sale for exploring a region.
In addition to not having a common way to obtain district maps, this bugged mission is also a strictly superior way to obtain bills of sale. It needs no weapon, takes 4 hours less than the "protect market" task, but has the same rewards, Factoring in the tasks required to obtain local maps, it takes 1 hour less assuming a single slot, and has much greater rewards.
Region map is blue, not white.
Unfortunately, this oversight has already been pointed out a while ago...
(http://nw-forum.perfectworld.com/showthread.php?251332-Leadership-bug-with-Chart-Region&highlight=District)
...and unsurprisingly nothing came out of it, as usual.
I would therefore suggest not to hold your breath regarding this issue and make the best of the growing pile of bills among your profession resources.
Cheerio!