I too have this error, but I am entering two T4's from two provinces.
I maxed out the CPP in Province A, and have CPP2.
In Province B, there is no CPP (as it's maxed out) but there is CPP2.
The software rejects the zero value in CPP.
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You can enter this manually in the 'Forms' section (T4), and ignore the error notification at the end.
However, I haven't seen if it will correctly NETFILE yet.
I guess if it won't I will try entering 0.01 and see where that gets me.
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I contacted Turbotax support today and they said that Turbotax will not let me enter T4's from multiple provinces !!!
Even if they are both the same province, it still won't let me save, so come on Intuit - fix this issue!
