For the Single Source/Sole Source, some Professors are also the department chair, so they have the signing authority to approve single source sole source form. Do I need to get approval from higher level such as Dean?

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Yes. Minimum of two signatures are required on the Single Source/Sole Source form before it’s forwarded to Purchasing Services. If the requestor happens to be the same person as who has the signing authority to approve the Single Source/Sole Source, such as the department chair, a higher level approval is required.