According to new legal docs, obtained by TMZ, Berry's got a final notice to appear in court at the end of June to deal with the unresolved matter in her divorce. Fact is ... she and Olivier are already officially divorced -- that happened in December 2016. They also resolved custody issues involving their son, Maceo.

We know there's a prenup, so there are no real issues. But the case is still technically active ... we've learned because Halle and Olivier have never filed their formal custody arrangement. The judge wants it done once and for all.

The judge wants them in court next month, and if they don't show they could be fined.