How to create credit memo in Oracle Project - 12.2.7

Hello,

Can someone give me steps to create credit memo for a reimbursable contract in projects? Oracle documentation says that i should create it from Expenditure but i don't see any way to do.

Should i do credit memo for the original invoice and interface the supplier cost and then generate new draft revenue and invoice?

I would really if some one can tell me know.

Thank you,

Rajeswari T