Thanks for all the caring answers. As a matter of fact tis about open sim and not precisely second life.
SL rules often apply there too. Technically I mean. Tis about an old shop of mine there, seven or eight years old. Maybe some residents visited already and up to now I had the merchandise free. I thought tis time to name a price for each item. The problem was I had to visit with an alt so that the buy option to appear in the edit menu.
I was trying to see if I can buy it myself. Stupid ha? For the rest simple enough. Right click, edit, for sale, copy, price, next owner only transfer.