Dear Abhishek,
It seems that you have maintained the same ISO code for 2 different measurement units with the same dimension.
You can assign the same ISO code to two different measurement units with the same dimension, However, this can lead to EDI problems later. EDI uses the ISO codes as a measurement unit key. If the same ISO code is maintained for several measurement units, a different measurement unit can be assigned to the ISO code measurement unit in the target system as in the source system.
Try to keep measurement unit <-> ISO code assignments unique.
Hope this helps,
Conor