Why Varchar columns use level number 49

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Why Varchar columns use level number 49





Recently I created a new table and had the requirement
to create one column with varchar data. 
In our project, we clone the existing DCLGEN, as our test
regions are on mainframe express and it does not support the creation of
DCLGEN. So while writing the DCLGEN, I noticed that a level number 49 is
mandatory for declaring the Varchar columns.
I really did not get the logic why the varchar columns must be declared on 
level number 49, if any of you can throw some light, it would be great
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