[Qgis-user] Not able to add new feature

Mon Mar 29 04:09:35 PDT 2021

Dear all, 

I'm trying to add a feature on my attribute table, just a new one with
some easy calculation from values of the same table. 

But: could not add the new field to the provider appears on my screen. 

I've done all steps but no way. 

I insert an image just trying to assign number 1 to the new feature I
would like to generate 

Thanks,
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