Error message when you use Web Services for Microsoft Dynamics GP: "Instance Validation Error: "" is not a valid value for PurchaseOrderType"


Adding an AD user to an IIS7 Web Site/Application Pool for use with Web Services
Error message when you use Web Services for Microsoft Dynamics GP: "An ISO 4217 Currency Code must be three characters long; your value is"
Error message when you use Web Services for Microsoft Dynamics GP: "Instance Validation Error: "" is not a valid value for PurchaseOrderType"
The maximum message size quota for incoming messages (65536) has been exceeded

In order to clear this up, do a

Select * from POP10100 order by POTYPE

If you see any POs that have an invalid PO Type (in my case there were '0's), you can probably delete them.

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