How to choose a best SAP support provider

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Outsourcing of SAP support and maintenance to a best SAP support provider is a very import factor as it directly impacts on the running of the company and management of their operation. There are 17000 plus SAP partner companies available in the global market as per the announcement by the SAP, making it challenging to choose the right and best SAP support provider for their specific needs. I need to know about the factors affecting the selection of SAP partners.