Can you please post your complete project or a shortened version that shows the error so that we all can have a look at all of your settings. To do so, use
Creator->File->Create Workspace Bundle (minimal)
and attach the resulting file.
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There is an issue implementing such design. It is not allowed and component datasheet talks about it.
Imagine a case, when both buffers are enabled and driving the same net with opposite logic, resulting in a short.
I would suggest drive the buffer outputs to bidirectional pins configured in open drain drive low (connect an external resistor high side - this is to support the case when both buffers disabled) and short the pins together externally. For the NAND gate input, use one of the buffer's feedback output signal.
thanks a lot , the setting is safe but not convenient..