I'd need the context to answer this definitively.
While SAP is generally accepted to be a company management software that you can look up by visiting their website, CDM could be any of a number of possible acronyms.
If there is some SAS context to your question, and that isn't clear, then I'd plump for Common Diagnostics Model.
However, CDM is also an acronym for a mechanism under the Kyoto protocol, which has a great deal of relevance at present.