Hi Sebastian,
Yes are correct as usual 
...
I was doing a testing, using a strategy plan, i selected the package 1M and schedule it without giving the scheduling period, which eventually created one call date.
Similarly if you choose the 6M package, it will do the same. This is similar to single cycle plan.
Only thing it triggered me is will there a request from business like this and we cannot avoid such situations. That's what i tried to propose.
Regards
Terence