I previously implemented Ariba but Ariba lost it’s momentum so I switched to SAP Supplier Relationship Manager (SRM) consulting. Demand is huge for both technical and functional SRM consultants. From a functional perspective, Ariba and SRM address the same Procure-To-Pay (PtP or P2P) business needs/processes — Purchases Requisitions entry/processing, Sourcing, Supplier Enablement, Catalog Management, Contract Management as well as T&E and electronic forms…Although SRM can be implemented standalone or tightly integrated with SAP ERP which provides a wide range of additional Financial, Logisitics and Human Resources fuctionality (for further info on SAP ERP check out http://www.erpgenie.com/sap/mysap/erp/). I’d recommend learning as much as you can about SAP SRM. To get some highly related core ERP backgound and skills, then look at SAP Material Management (MM) and Financials (FI). You might also want to check out SAP Workflow. If you’re really interested in Supply Chain processes, look at the SAP Supply Chain Management (SCM) suite of applications (http://www.scmexpertonline.com). If you’re interested in Travel Management, you might also look into SAP Travel Manager (part of SAP HR) but you’re plate will be full with SRM, MM, FI. Finally if your interested in electronic forms, look into SAP Adobe intractive forms, SmartForms or Business Server Pages (BSP) — in that order. I’ve found the books at http://www.sap-press.com/ to be good. Hope this helps and good luck with your retooling.
I agree with the above advice from the expert above. However you need to be careful not to spread too much. I have seen people knowing many areas of SAP. But at any one time, I believe we need to concentrate and specialise in an area. Then review your interests and achievements and if you like, switch or spread.