Since there is no GS1 Member Office in Ethiopia Ethiopian manufacturers, suppliers or repackagers should get their Company Prefix and barcode package from another GS1 Member Organizations. You will find all the GS1 Member Organizations here: https://www.gs1.org/contact and Some suggested GS1 Member Organizations include:
GS1 Kenya / http://www.gs1kenya.org/
GS1 Nigeria / https://www.gs1-nigeria.org/
GS1 Egypt / https://gs1eg.org/
GS1 South-Africa / https://www.gs1za.org/ and others