21448 contract law/ sale of immovable property/ form of contract Civil Code contract law invalidation of contract volume 4 sale of immovable property form of contract Federal supreme court of Ethiopia cassation decisions contract of sale የማይንቀሳቀስ ንብረት ሽያጭ ውል በአዋዋይ ወይም በፍርድ ቤት ፊት መደረግ ያለበት ስለመሆኑ የፍ/ብ/ህ/ቁ. 1723 1727 2877 2878 Cassation 21448