Can I reduce CCA on my rental condo 4% to adjusted amount in Area A Calculation of CCA claim (Box 12 amount).

can I reduce CCA on my rental condo 4% to adjusted amount in Area A Calculation of CCA claim (Box 12 amount).  

I try to overwrite in CCA Claim sheet, but I get message that If I overwrite, I will not be able to Net file.  

Fortunately I get a tip from turbotax "Your non-refundable credits exceed your tax payable.  Consider reducing capital cost allowance in your self-employment or rental income."  Nice to save some money.

Self-employed

You can do this and you should be able to NETFILE.  The message you are getting is just letting you know that you are overwriting.