When can i modify the 'Expression' field in the tab [Attribute Settings]?

Question 1:
I have created a View Object. Then, i would like to retrieved a formatted column from it, to be simple, I try to modify in the [Attribute Settings] tab - field 'Expression', when I found the field cannot be modified. (The field is having NUMBER type and not allow NULL value). Must I 'new' an attribute to obtain the formatted column ... if yes, seems confusing that i need to include 2 columns with the same content but different format ~~~ seems not flexible enough bo ... please advice!
Question 2:
I found whenever I try to build a view to include necessary columns into the right-handed side. I found all primary keys for the entity are forced to be included? Is it a must? Will it decrease performance for handling more retrieved columns?
Thanks for replying!

Question 1:
I have created a View Object. Then, i would like to retrieved a formatted column from it, to be simple, I try to modify in the [Attribute Settings] tab - field 'Expression', when I found the field cannot be modified. (The field is having NUMBER type and not allow NULL value). Must I 'new' an attribute to obtain the formatted column ... if yes, seems confusing that i need to include 2 columns with the same content but different format ~~~ seems not flexible enough bo ... please advice!'Expression' is for the default value. For formatting, you need to use Control Hints. Please see the following OTN article for details.
http://forums.oracle.com/forums/message.jsp?id=844274
Question 2:
I found whenever I try to build a view to include necessary columns into the right-handed side. I found all primary keys for the entity are forced to be included? Is it a must? Will it decrease performance for handling more retrieved columns?For an EO based VO, the PK must be included. This is so that when the VO brings the data in from database table, the data can be decomposed into entity objects that are registered to the entity cache. Since entity object instances are uniquely identified by their PK attrs, they must be included.
In terms of performance, inclusion of PK shouldn't cause a notable degradation unless the PK values take up a lot of memory. But, PKs should never big huge (in memory consumption) objects anyway.
Thanks.
Sung

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