15992 contract law form of contract Civil Code Volume 1 contract law formation of contracts forms of contract form of contract Federal supreme court of Ethiopia cassation decisions በህግ የተዯነገገው የውሌ አፃፃፌ /ፍርም/ የተሰጠ ዯንብ አሇመፇፀም ስሇሚያስከትሇው ውጤትየፌ/ብ/ህ/ቁ. 1719 172ዏ (1) 1723 1726 1727 184 Cassation decison no.15992 '