This error can re-create or happens on all Windows 7 clients. Every time, users select Home > Purchasing > Purchase Order Transactions. They receive this error. Click OK and continue on just fine. Strange!
Server:
Hyper-V R2 SP1 Host
SBS 2011 as Guest
SQL 2008 R2 Express RTM on SBS 2011
GP2010 R2 RTM

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