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CCS5.5 code sense don't work within #if ... #else ...#endif statement

 Hi,
My target CPU is c283x.  I find CCS5.5 code sense don't work  within #if ... #else ...#endif statement, especially for bit fields, see following pictures

i don't know why. and, if the data  structure is defined by user(not TI), there is no code sense

sometimes the code sense don't work at all, my setting is

can someone help me? thanks in advance