Unable to edit Shipping date and Expiry date in "Feed Custom Data for Computers" Section

Unable to edit Shipping date and Expiry date in "Feed Custom Data for Computers" Section

 I am Unable to edit Shipping date and Expiry date in  "Feed Custom Data for Computers" Section. It is not allowing me to edit the field, even though I can edit the computer location and product number. Please help me out in this case.



Regards 
Jobin Jose      

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