Reentering the Schengen space with a single-entry long stay D national visa and permit of stay

I'm studying in Italy I hold an Italian permit of stay. But my long-stay Italian national visa is for a single entry.
Can I leave and reenter freely in the Schengen space, for example to make a travel to Croatia, using the permit of stay?
My current information is that with the permit of stay I can travel freely outside and return to the Schengen space, but I'm wondering if it is not in contradiction with the number of entries in my visa.
Thanks.
Best Answer
If you with 'permit to stay' mean a regular residence permit, the residence permit replaces your national visa. The residence permit allows you to freely enter and exit the Schengen area with no limit to the number of entries.
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Type D Schengen visa or national long-stay visa The national visa is the type D long-stay Schengen visa. It is mandatory for any foreigner wishing to study, work or live in a Schengen country for longer than 90 days (up to 1 year).How can I stay in Schengen Area longer than 90 days?
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