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Unable to change flowmask error message on Cisco 6500
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You will not be able to change the flowmask after you configure NAT. You might be hitting the bug CSCsb41562 (fixed on 12.2(18)SXF)

Actually it is not a bug I think it is a feature, and I am not sure that it will be fixed. If you use the NAT you cannot use full-flow for Netflow , because of some internal restrictions: NAT and Netflow uses different flow masks and they are not compatible.
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