Merchant Archive

Transferring items between my crafting house and shop.

When I retrieve the backpack, gets error I cannot retrieve it. Tried to sell it, and then buy it with another character. But it gets sold from the stockroom, but never appears under the For Sale room.

This happened with 2 backpacks.

Odd as this is. I was able to find and retrieve these items through another vendor.

Are you sure they were retrieved from the right vendor?

"For Sale" and "Stockroom" are default in the "Region" view. Means you see all items on all vendors in the area. You can retrieve stuff from one vendor via another if they are close enough too.
If you put it up for sale again from the stockroom, it goes to the very merchant it was originally on. Very handy since you can put stuff back from Tatooine on your Dantooine Vendor

So it might have been you are looking at Vendor A, see a backpack which is on Vendor B though. You put it into the stockroom, tried to retrieve it and since its close to Vendor B it would have been able to retrieve via Vendor A but your inv was full.
You put it back up, it goes back to Vendor B. Now of course another char looking at vendor A only sees stuff on Vendor A and theres no backpack.

If Vendor A and B are too far away you also get a "can't retrieve this item" message, its a different one I think though, not sure.