I was trying to un-managed import solution from development instance to SIT. Below are the some observations while importing.
1. For the First time, Solution got imported successfully in SIT but later on it is failing in solution import with same entity.
2. It is also failing, if i tries to re import in SIT environment from the solution taken from Development and SIT environment without any modifications done in customisation XML.
Please suggest, What could be the probable cause and its solution? Also in Import log we don't have much relevant information that i could use for troubleshooting.