AnD4D
One thing is package ID visible in config.xml
<tizen:application id="<random ID here>.MySuperChickenBlast" package="<random ID here>" required_version="2.2"/>
package ID should be unique - you can random generate it on config.xml view in Tizen IDE...
Second thing is Tizen Store ID which is ID given to you by Tizen Store
so what to do?
1) just generate random package ID in Tizen SDK (or put your own code - but remember that when you submit app with SPECIFIC package ID - then later you can't change this package ID (so if you submit app with NEW package id - it will be treated like a new app)
2) upload to Tizen Store
3) when uploaded to Tizen Store, then automatically you get Tizen Store ID
(this 12 digit number)
4) this 12 digit number you can submit to Tizen App Challenge