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@jennisbsvb wrote:

 but I am hesitant to use a code that is wrong. And since it works on other types of returns, I know it's not the code that is wrong. 

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Why are you refusing to look at the Instructions?  They have a list of the IRS codes. The codes you have mentioned are NOT on the list, so they are invalid codes.

So really, the problem may be the Schedule C and 1065s are incorrectly not giving you an error code, because you are entering a number that is not on the list in the Instructions.