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in general, the entry that is present by default in advmap-startup(false = nil) actually triggers a warning that the value false is undefined. It is logical to assume that you have a redefinition of false somewhere. However, if the same result is obtained with not IsObjectExists('T1'), then the problem is clearly not in this (when I try to reproduce a similar situation, I get an adequate result, i.e., the existence is correctly determined).
Нет войне.