It sounds like you declared a datasource/assortment while drafting the export template in the UAT environment.
Assortment data does not transfer between systems, so your Production server is essentially searching for an assortment that does not exist (because it only exists in UAT).
If you can open the template in Prod you can probably just reassign the assortment. If this doesn't work try deleting the assignment [as pictured] in the UAT server, save the template, then use "Save format template as file..." option to send an updated copy of the template.
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Please open the export template and make the assortment editable in data source properties. It will work fine.:-)
Thanks for the answer, it did work.
Have a nice day
The assortment was already editable but your answer give me and idea and i check the update assortment as editable and it works
Your help made me extra happy you know why
Have nice day and thank you for caring.
and Good luck to you too!!