Retirement tax questions

Here is what the software guidance says that includes line 18 of Form 1116. For more information on Section 901 please see: Part 1 Section 901.—Taxes of Foreign Countries- IRS.

What is happening and what are you trying to accomplish with line 1A? Line 1A is entered as you go through the program and I am sure you know that. 

1. As you go through the 1116, you have one for each category of income.  You select the country,
2.  on the next screen select report income. 
3. Continue through the screens selecting source and income.