SPSS Statistics

In the SPSS Statistics documentation under Comparing Column Proportions it says:
"Also, note that the Separated column is marked with a ".", which indicates that the observed proportion of separated people in the Unemployed, laid off row is either 0 or 1, and therefore no comparisons can be made using that column for unemployed respondents."

Why doesn't SPSS do significance testing vs. 0 or 1? Is there a way to override that setting?  When I run tables and one group is 100% and the other is 20%, that is clearly a significant difference but SPSS doesn't test it.

Thoughts?

CTABLES perform asymptotic tests only, which cannot test "degenerate" cases such as 0 or 100 percent in a cell. For st. error of the statistic cannot be computed then. Use exact method testing.