Leaving the country of residence more than once with a global pass

Hello together,

I plan on going on my first interrail journey in about a month with a 7 day global pass. And I know that one can split their days of travel over the whole month, still I'm not sure about the following topic:

I think of visiting spain for around a week, using 3-4 of my travel days, and visiting Amsterdam for a Weekend, using 2 of those travel days. Still, I plan on coming back to my country of residence in between these journeys and I recently heard, that with an interrail pass you can only leave/arrive your country of residence once. So, what I am basically asking is: Is that true? I did not find an answer addressing this issue, maybe someone else knows.

Thank you in advance,

Lisa :)