Additional fields problem

Additional fields problem

I first have created an Additional Fields call "Company" in Workstation, but after that I find that the field should be created for all assets, so I created a "Company" field in Asset Management - Asset Additional Fields and delete the one in Workstation - Additional Fields.
However when I create Custom report in Asset explorer, there are still 2 "Company" for me to choose in available column, I have checked the Query and one "Company" is from wsfields.udf_char1 and one "Company" is from resfields.udf_char1, how can I delete the unused one in the available columns when generating report.
Thanks for your help 
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