Akash,
Would you please post or send screen shot of PSA which is showing data type and BODS target data type
can you try it again below steps .
1. create a one dummy DS try it some time it will work
2. in between PSA and BODS dump the data in text file find out what data is sending to PSA
3. PSA level before load to PSA use debug mode and check how the conversion is happening
we faced similar issues point 1 worked
Regards,
Manoj.