Why am I unable to create a change order?
Review the descriptive flexfield settings for the Item Change Management module. Be sure that the value of context segment is set to ORA_EGO_CHANGE_TYPES_VS.
Here's how you review and edit the flexfield:
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            Execute the Manage Descriptive flexfield task in the Setup and Maintenance work area. 
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            Search for the flexfield code EGO_ENGINEERING_CHANGES and edit the flexfield. 
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            In Context Segments review the Value Set field. Be sure that the value is set to ORA_EGO_CHANGE_TYPES_VS. 
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            Click Save. You must deploy flexfields after you save the task.