convert body line after using extrude cut tool

Hello guys, im having an issue in solidworks.

Im trying to add fillet on the edge marked is red:

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the result need to be this:

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But i get this:

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i think that this problem occurs because the fillet must be used on the missing body line marked in yellow:

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Is there any way to convert the missing bodyline tomy feature? or is there any other way to make this fillet?

thanks