Currently, people do not understand why they cannot change it and often get confused.
For instance, check out the following support tickets:
Q528873
Q262351
B148189
Of course, we need to modify our related code to look at this property instead of the ITypesInfo.DefaultMember one.
Probably consider renaming this to LookupDisplayMember so that people could easily understand what it is for. Currently, not everyone understands the "DefaultProperty".
See Also:
Core - Introduce a LookupDisplayMember property allowing to specify a criteria string that will define a composite lookup property display value
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