Defining Source System in BI 7.0
BI 7.0 Source System Definition for Source System with Basis Release lower than 640 is quite different.
As of release 640, you can use upper and lower case characters for user passwords. This is only uppercase characters for previous releases. Remember that your passwords are automatically converted to uppercase in previous releases.
As BI System has Basis 700 in bottom, upper and lower case passwords are important.