Form 1041 Line 8 income to PA-41

I am preparing a return for an estate that had income reported on a 1099-R with Box 7 code 4. Review reports "You have reported other income on line 8 of federal Form 1041. Review the PA government instructions for reporting this income on the PA-41."

Any suggestion how to proceed?  I don't find any helpful info in the PA-41 instructions