You do not need a seperate license to use AME. You automatically obtain the license for AME for every product you are licensed for. For example, if you have the license iProcurement, the you automatically have the license to use AME with iProcurement.
If AME is showing up as not installed please review Note 209389.1 Approvals Manager Product Showing as not Installed
Do Users Need A Seperate License To Use Approvals Management (AME)? (Doc ID 413520.1)
Refer the following document for information related to AME responsibilities.
Oracle Approvals Management Not Enabled? What Does It Take To Enable It? (Doc ID 413300.1)
Thanks Sireesha for the Note Ids
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