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Neither of those is a complete sentence. Please give a just a bit more context so we can help. But I'll answer stochastically: you're right, if it's one PM (singular), then it should be has. – F'xMar 4 '11 at 11:06
+1 correct - though it's worth noting that "Project Managers" would usually be abbreviated to "PMs". But the same argument also applies because it could refer to a group such as "Product Marketing" :-) – psmearsMar 4 '11 at 11:51