Value category Customization - Cost Element category

Dear All,

I have reviewed OSS 676123 - Project Information Database / Value Category Customizing and need to do the same for one of my existing clients. OSS ONLY mentions Cost Element types - 1, 11 or 12. There is no mentioning of CE Category - 90.

Do I / Can I still include the Cost Elements from CE Category - 90, as the Costs get updated during GRN (for Procurement with Acct. Assgnt 'Q') & that these values get credited once Goods Issue is done / and Debit value hits the Expense GL. Please advise.

-Thanks