Proximity makes some decisions about obeying or ignoring case sensitivity that have an impact on how you write conditions, specifically

Proximity converts all attribute names to lower case for its internal representation both when importing data and when evaluating conditions and constraints on a query. You can therefore ignore case when specifying the name of an attribute in a query’s condition or constraint.

Proximity does not change the case of any attribute value, however. For example, you can write the condition ObjType = Movie with the attribute specified as objtype, Objtype, or OBJTYPE because all of these will be converted to the lower case form. But Proximity will not match objects with a value of movie for this attribute because the condition requires the capitalized value Movie to be a match.