Ethiopia's constitutional right to secede doesn't necessarily mean Recognition from the African Union. The AU law supersedes Ethiopias constitution.
Somalias constitution isn't even respected in Somalia, forget Africa or the International community. The constitution states that federal regions are to be created based on the borders of the 18 regions of the former Somali republic.
Then you have the self proclaimed mother of federalism creating its borders based on tribe irrespective of Somalias Constitution
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This is why the AU maintains that borders of independence(colonial borders) are sacrosanct. And that is why when it comes to Somaliland & Somalia no one will ever take the tribal bush cries of somalians over some bush clan in 1 district of sanaag and few districts of eastern sool