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Newsgroups: comp.lang.ada
Date: Wed, 12 Feb 2020 11:25:38 -0800 (PST)
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Subject: Re: Generic Parent Specification
From: AdaMagica <christ-usch.grein@t-online.de>
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Xref: reader01.eternal-september.org comp.lang.ada:58037
Date: 2020-02-12T11:25:38-08:00
List-Id: <comp.lang.ada>

You missed the with clause:

with X.Y;
generic
  with package K1 is new X    (<>);
  with package K2 is new K1.Y (<>);
package P is
  o1 : K2.T2 := 0;
  o2 : K1.T1 := o1;
end P;

Note the name X.Y in the with clause and K1.Y in the instantiation.