We all have read the text that outlines the agreement between the State of Eritrea and the Federal Democratic Republic of Ethiopia.
Deals are deals because there is give and take and it is messy.
Even then, what did it get that it couldn't have gotten by signing the Technical Arrangements in August 1999 because those documents would have given Ethiopia Zalambesa and Alitena without any bloodshed. I think there were a few reasons. With regard to the Framework Agreement, the OAU had tried to address Eritrea's reservation that the withdrawal would NOT in any way prejudice future outcome. It did neither. The rest is history.