I am working on an adventure map that involves keys that you can place down on blocks to open doors (i.e. a lever or button) however, I have two concrete blocks that act as the key holder for each key. The keys also must be placed in a specific order beside the doors, so I decided to color code the doors with different colored concrete. However, when using the CanPlaceOn data tag for each item, (this map is also in adventure mode) I found that I was unable to specify the data value of the block that I wanted to place the key on, resulting that you can place the key for the red concrete door on the blue one. Does anyone have a way around this?