If your income is from multiple countries or you don't know what country your foreign income is from, enter 'Various' in the box labelled "Source country of foreign income".

The TurboTax Standard does not allow one to enter any value. There is only a drop down menu with choices U.S.A., Country #2, Country #3.  Given that what should be entered there? The actual source country(ies) is not known! 

I am using Premier with the same issue... 

If you don't know, or the income is from multiple countries, just pick Country #2 or Country #3 on the Foreign Slip. 

If you are claiming the Foreign Tax Credit for the income, you can ask who ever issued the slip where the income is from, or enter Global if it's from more than one country.