/summon command not fully working/Invalid Command Syntax

I was doing, yet another command experiment and I tried to add a data tag to a skeleton horse with commands. I tried to summon it tamed, but it said "Invalid Command Syntax". Here is the command I used: /summon skeletonhorse ~ ~ ~ {Tame:1}. It works on PC edition, but not pocket edition. This also affects other entities. /summon skeletonhorse works properly but /summon skeletonhorse ~ ~ ~ {Tame:1} does not work at all and gives me the invalid command syntax message.