What determines whether an application gets a green check or a yellow warning sign in the deployment summary screen when using an MDT/UDI task sequence?

I am trying to get Office 2010 to install using a UDI task sequence, and it IS installing, but it has a yellow exclamation point next to it at the summary screen after the task sequence completes, as does another app I am trying to install.

The apps that use an .MSI are fine, and get the green check, but the two apps that use .exe for their installers get the yellow warning sign.  I assume this has to do with exit codes or detection rules, but I am very new to SCCM (using 2012 and MDT 2012 Update 1), so I need some help.

Thank you! 

EDIT: This probably has to do with the fact that SuccessOrFailureCode being blank.  I have been pouring over .vbs scripts and logs, but they all seem to indicate that my application installs just fine, with an exit code of 0. Where does this screen get the SuccessOrFailureCode?

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