PO release strategy Classification

Dear all,

I have a question about PO release strategy would like to ask, hope you can give me some advice.

I have about ten release strategies which is used for different requirements.

For each release strateg, there are several Classification.

I am going to set a new release strategy, which only concern some of the Classifications, for the non-used Classifications, I have set a '*' to be the value, but the release strategy does work.

I would like to know is it all Classification should be provided a value?

Many Thanks

Sunny