Scenario: Code is built on OD version 6. Imported the code and tried to clean build in OD version 7

Result/Issue:
Additional "_" is added to the "_" in variables in IProjectVariables.java

Example:
The original variable in IProjectVariables in version 6 is RETURN_CODE

After clean build the same code in version 7, the same variable is changed to RETURN__CODE.

Suspecting it is the compatibility issue.

Is this your local project variable ?