Problem
I had a similar issue to your's when I upgraded from SAP Business One 9.2 PL03 to PL08 HF02. It wasn't on ProductionOrders, but instead if I tried to access any of the DI-API properties that had been added since PL03, such as CompanyInfo.B1iTimeOut, it would result in:
System.MissingMethodException: Method not found: 'Int32 SAPbobsCOM.ICompanyInfo.get_B1iTimeOut()'.
Solution
Updating SAPBusinessOneSDK.dll in the GAC following the answer in this ticket resolved my issue: https://answers.sap.com/questions/202319/sapbusinessonesdkdll-1.html
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