This is what I'm able to find at the moment: F1116-012 from 2013 Business rules
Missing document "If for any country in Form 1116, Line 2 'ForeignIncRelatedExpensesAmt' has a non-zero value, then [ForeignIncmRelatedExpensesStmt] must be attached to Line 2" 

Part 1 line 2: "Expenses definitely related to the income on line 1a (attach statement) "
"... if you are reporting foreign business income on line 1a, include on line 2 business expenses such as supplies and advertising incurred as part of operating the foreign business. " From 1116 Instructions 
Help article: Attaching PDFs to business returns for e-filing in ProSeries Professional 

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