Hi
I have read message #583143 and other relavent thread. I would like to clarify that:

Does it meant, adding 
field1   C(10)
field2   I
fieldPrimary    

before fieldprimary able to solve the problem of primary key corruption?
Also, If my primarykey is a composite key which combine 2 or more fields, do I need to add 2 dummy fields too?
Ex.
FieldA
FieldB
FIeldC

Index Expr:
PrimaryKey FieldB+FieldC

Or I should have a additional field that is combination of FieldB and C?

Thank you